diff --git a/bbp_ng/PROP_ballance_element.py b/bbp_ng/PROP_ballance_element.py
index 990ac25..2d9e525 100644
--- a/bbp_ng/PROP_ballance_element.py
+++ b/bbp_ng/PROP_ballance_element.py
@@ -81,8 +81,8 @@ class BBP_PG_ballance_element(bpy.types.PropertyGroup):
         type = bpy.types.Mesh
     )
 
-def get_ballance_elements() -> bpy.types.CollectionProperty:
-    return bpy.context.scene.ballance_elements
+def get_ballance_elements(scene: bpy.types.Scene) -> bpy.types.CollectionProperty:
+    return scene.ballance_elements
 
 #endregion
 
@@ -151,9 +151,7 @@ def _load_element(mesh: bpy.types.Mesh, element_id: int) -> None:
                 v: UTIL_virtools_types.VxVector2 = UTIL_virtools_types.VxVector2()
                 yield v
             mesh_part.mVertexUV = vuv_iterator()
-            def mtl_iterator() -> typing.Iterator[bpy.types.Material]:
-                pass
-            mesh_part.mMaterial = mtl_iterator()
+            mesh_part.mMaterial = iter(tuple())
             def face_iterator() -> typing.Iterator[UTIL_blender_mesh.FaceData]:
                 # create face data with 3 placeholder
                 f: UTIL_blender_mesh.FaceData = UTIL_blender_mesh.FaceData([UTIL_blender_mesh.FaceVertexData() for i in range(3)])
@@ -191,13 +189,14 @@ class BallanceElementsHelper():
     This class should only have 1 instance at the same time. This class support `with` syntax to achieve this.
     This class frequently used in importing stage to create element placeholder.
     """
-
     __mSingletonMutex: typing.ClassVar[bool] = False
     __mIsValid: bool
+    __mAssocScene: bpy.types.Scene
     __mElementMap: dict[int, bpy.types.Mesh]
 
-    def __init__(self):
+    def __init__(self, assoc: bpy.types.Scene):
         self.__mElementMap = {}
+        self.__mAssocScene = assoc
 
         # check singleton
         if BallanceElementsHelper.__mSingletonMutex:
@@ -223,7 +222,7 @@ class BallanceElementsHelper():
             # write to ballance elements property and reset validation
             self.__write_to_ballance_elements()
             self.__mIsValid = False
-            self.__mSingletonMutex = False
+            BallanceElementsHelper.__mSingletonMutex = False
     
     def get_element(self, element_id: int) -> bpy.types.Mesh:
         if not self.is_valid():
@@ -245,7 +244,7 @@ class BallanceElementsHelper():
         return new_mesh
 
     def __write_to_ballance_elements(self) -> None:
-        elements: bpy.types.CollectionProperty = get_ballance_elements()
+        elements: bpy.types.CollectionProperty = get_ballance_elements(self.__mAssocScene)
         elements.clear()
 
         for eleid, elemesh in self.__mElementMap.items():
@@ -258,7 +257,7 @@ class BallanceElementsHelper():
             item.mesh_ptr = elemesh
 
     def __read_from_ballance_element(self) -> None:
-        elements: bpy.types.CollectionProperty = get_ballance_elements()
+        elements: bpy.types.CollectionProperty = get_ballance_elements(self.__mAssocScene)
         self.__mElementMap.clear()
 
         item: BBP_PG_ballance_element
@@ -271,9 +270,9 @@ class BallanceElementsHelper():
             # add into map
             self.__mElementMap[mesh_id] = item.mesh_ptr
 
-def reset_ballance_elements() -> None:
+def reset_ballance_elements(scene: bpy.types.Scene) -> None:
     invalid_idx: list[int] = []
-    elements: bpy.types.CollectionProperty = get_ballance_elements()
+    elements: bpy.types.CollectionProperty = get_ballance_elements(scene)
 
     # re-load all elements
     index: int = 0
@@ -302,8 +301,8 @@ def reset_ballance_elements() -> None:
 class BBP_UL_ballance_elements(bpy.types.UIList):
     def draw_item(self, context, layout: bpy.types.UILayout, data, item: BBP_PG_ballance_element, icon, active_data, active_propname):
         if item.element_name != "" and item.mesh_ptr is not None:
-            layout.label(text = item.element_name)
-            layout.label(text = item.mesh_ptr, icon = 'MESH_DATA')
+            layout.label(text = item.element_name, translate = False)
+            layout.label(text = item.mesh_ptr, translate = False, icon = 'MESH_DATA')
 
 class BBP_OT_reset_ballance_elements(bpy.types.Operator):
     """Reset all Meshes of Loaded Ballance Elements to Original Geometry."""
@@ -316,7 +315,7 @@ class BBP_OT_reset_ballance_elements(bpy.types.Operator):
         return context.scene is not None
     
     def execute(self, context):
-        reset_ballance_elements()
+        reset_ballance_elements(context.scene)
         return {'FINISHED'}
 
 class BBP_PT_ballance_elements(bpy.types.Panel):
diff --git a/bbp_ng/PROP_virtools_group.py b/bbp_ng/PROP_virtools_group.py
index d0f3e23..adeea49 100644
--- a/bbp_ng/PROP_virtools_group.py
+++ b/bbp_ng/PROP_virtools_group.py
@@ -1,8 +1,365 @@
 import bpy
+import typing
 from . import UTIL_functions
 
+#region Virtools Groups Define & Help Class
+
 class BBP_PG_virtools_group(bpy.types.PropertyGroup):
     group_name: bpy.props.StringProperty(
-        name = "Group Name", 
+        name = "Group Name",
         default = ""
     )
+
+def get_virtools_groups(obj: bpy.types.Object) -> bpy.types.CollectionProperty:
+    return obj.virtools_groups
+
+def get_active_virtools_groups(obj: bpy.types.Object) -> int:
+    return obj.active_virtools_groups
+
+def set_active_virtools_groups(obj: bpy.types.Object, val: int) -> None:
+    obj.active_virtools_groups = val
+
+class VirtoolsGroupsHelper():
+    """
+    A helper for object's Virtools groups adding, removal and checking.
+
+    All Virtools group operations should be done by this class.
+    Do NOT manipulate object's Virtools group properties directly.
+    """
+    __mSingletonMutex: typing.ClassVar[bool] = False
+    __mIsValid: bool
+    __mAssocObj: bpy.types.Object
+    __mGroupsSet: set[str]
+    
+    def __init__(self, assoc: bpy.types.Object):
+        self.__mGroupsSet = set()
+        self.__mAssocObj = assoc
+        
+        # check singleton
+        if VirtoolsGroupsHelper.__mSingletonMutex:
+            self.__mIsValid = False
+            raise UTIL_functions.BBPException('VirtoolsGroupsHelper is mutex.')
+        
+        # set validation and read ballance elements property
+        VirtoolsGroupsHelper.__mSingletonMutex = True
+        self.__mIsValid = True
+        self.__read_from_virtools_groups()
+    
+    def is_valid(self) -> bool:
+        return self.__mIsValid
+    
+    def __enter__(self):
+        return self
+    
+    def __exit__(self, exc_type, exc_value, traceback):
+        self.dispose()
+    
+    def dispose(self) -> None:
+        if self.is_valid():
+            # write to ballance elements property and reset validation
+            self.__write_to_virtools_groups()
+            self.__mIsValid = False
+            VirtoolsGroupsHelper.__mSingletonMutex = False
+    
+    def __check_valid(self) -> None:
+        if not self.is_valid():
+            raise UTIL_functions.BBPException('calling invalid VirtoolsGroupsHelper')
+    
+    def add_group(self, gname: str) -> None:
+        self.__check_valid()
+        self.__mGroupsSet.add(gname)
+    
+    def add_groups(self, gnames: typing.Iterable[str]) -> None:
+        self.__check_valid()
+        self.__mGroupsSet.update(gnames)
+    
+    def remove_group(self, gname: str) -> None:
+        self.__check_valid()
+        self.__mGroupsSet.discard(gname)
+    
+    def remove_groups(self, gnames: typing.Iterable[str]) -> None:
+        self.__check_valid()
+        for gname in gnames:
+            self.__mGroupsSet.discard(gname)
+    
+    def contain_group(self, gname: str) -> bool:
+        self.__check_valid()
+        return gname in self.__mGroupsSet
+    
+    def contain_groups(self, gnames: typing.Iterable[str]) -> bool:
+        """
+        Check existing intersection between group names and given collection.
+
+        In other words, check whether group name of given paramter is in group names with OR operator.
+
+        @param gnames[in] Iterable group names to check.
+        @return return True if the length of the intersection between group names and given group names is not zero.
+        """
+        self.__check_valid()
+        for gname in gnames:
+            if gname in self.__mGroupsSet:
+                return True
+        return False
+    
+    def clear_all_groups(self):
+        self.__check_valid()
+        self.__mGroupsSet.clear()
+    
+    def __write_to_virtools_groups(self) -> None:
+        groups: bpy.types.CollectionProperty = get_virtools_groups(self.__mAssocObj)
+        sel: int = get_active_virtools_groups(self.__mAssocObj)
+        groups.clear()
+        
+        for gname in self.__mGroupsSet:
+            item: BBP_PG_virtools_group = groups.add()
+            item.group_name = gname
+        
+        # restore selection if necessary
+        if sel >= len(self.__mGroupsSet):
+            sel = len(self.__mGroupsSet) - 1
+        if sel < 0:
+            sel = 0
+        set_active_virtools_groups(self.__mAssocObj, sel)
+    
+    def __read_from_virtools_groups(self) -> None:
+        groups: bpy.types.CollectionProperty = get_virtools_groups(self.__mAssocObj)
+        self.__mGroupsSet.clear()
+        
+        item: BBP_PG_virtools_group
+        for item in groups:
+            self.__mGroupsSet.add(item.group_name)
+
+#endregion
+
+#region Preset Group Names
+
+_g_VirtoolsGroupsPreset: tuple[str] = (
+    "Sector_01",
+    "Sector_02",
+    "Sector_03",
+    "Sector_04",
+    "Sector_05",
+    "Sector_06",
+    "Sector_07",
+    "Sector_08",
+    
+    "P_Extra_Life",
+    "P_Extra_Point",
+    "P_Trafo_Paper",
+    "P_Trafo_Stone",
+    "P_Trafo_Wood",
+    "P_Ball_Paper",
+    "P_Ball_Stone",
+    "P_Ball_Wood",
+    "P_Box",
+    "P_Dome",
+    "P_Modul_01",
+    "P_Modul_03",
+    "P_Modul_08",
+    "P_Modul_17",
+    "P_Modul_18",
+    "P_Modul_19",
+    "P_Modul_25",
+    "P_Modul_26",
+    "P_Modul_29",
+    "P_Modul_30",
+    "P_Modul_34",
+    "P_Modul_37",
+    "P_Modul_41",
+    
+    "PS_Levelstart",
+    "PE_Levelende",
+    "PC_Checkpoints",
+    "PR_Resetpoints",
+    
+    "Sound_HitID_01",
+    "Sound_RollID_01",
+    "Sound_HitID_02",
+    "Sound_RollID_02",
+    "Sound_HitID_03",
+    "Sound_RollID_03",
+    
+    "DepthTestCubes",
+    
+    "Phys_Floors",
+    "Phys_FloorRails",
+    "Phys_FloorStopper",
+    
+    "Shadow"
+)
+
+class SharedGroupNameInputProperties():
+    group_name_source: bpy.props.EnumProperty(
+        name = "Group Name Source",
+        items = (
+            ('DEFINED', "Predefined", "Pre-defined group name."),
+            ('CUSTOM', "Custom", "User specified group name."),
+        ),
+    )
+    
+    preset_group_name: bpy.props.EnumProperty(
+        name="Group Name",
+        description="Pick vanilla Ballance group name.",
+        items=tuple(
+            # token, display name, descriptions, icon, index
+            (str(idx), grp, "", "", idx) for idx, grp in enumerate(_g_VirtoolsGroupsPreset)
+        ),
+    )
+    
+    custom_group_name: bpy.props.StringProperty(
+        name = "Custom Group Name",
+        description = "Input your custom group name.",
+        default = "",
+    )
+    
+    def draw_group_name_input(self, layout: bpy.types.UILayout) -> None:
+        layout.prop(self, 'group_name_source', expand=True)
+        if (self.group_name_source == 'CUSTOM'):
+            layout.prop(self, 'custom_group_name')
+        else:
+            layout.prop(self, 'preset_group_name')
+    
+    def general_get_group_name(self) -> str:
+        if self.group_name_source == 'CUSTOM':
+            return self.custom_group_name
+        else:
+            return _g_VirtoolsGroupsPreset[int(self.preset_group_name)]
+
+#endregion
+
+#region Display Panel and Simple Operator
+
+class BBP_UL_virtools_groups(bpy.types.UIList):
+    def draw_item(self, context, layout: bpy.types.UILayout, data, item: BBP_PG_virtools_group, icon, active_data, active_propname):
+        layout.label(text = item.group_name, translate = False, icon = 'GROUP')
+
+class BBP_OT_add_virtools_groups(bpy.types.Operator, SharedGroupNameInputProperties):
+    """Add a Virtools Group for Active Object."""
+    bl_idname = "bbp.add_virtools_groups"
+    bl_label = "Add to Virtools Groups"
+    bl_options = {'UNDO'}
+    
+    @classmethod
+    def poll(self, context: bpy.types.Context):
+        return context.object is not None
+    
+    def invoke(self, context, event):
+        wm = context.window_manager
+        return wm.invoke_props_dialog(self)
+    
+    def execute(self, context):
+        # add group
+        with VirtoolsGroupsHelper(context.object) as hlp:
+            hlp.add_group(self.general_get_group_name())
+        return {'FINISHED'}
+    
+    def draw(self, context):
+        self.draw_group_name_input(self.layout)
+
+class BBP_OT_rm_virtools_groups(bpy.types.Operator):
+    """Remove a Virtools Group for Active Object."""
+    bl_idname = "bbp.rm_virtools_groups"
+    bl_label = "Remove from Virtools Groups"
+    bl_options = {'UNDO'}
+    
+    ## This class is slightly unique.
+    #  Because we need get user selected group name first.
+    #  Then pass it to helper.
+    
+    @classmethod
+    def poll(self, context: bpy.types.Context):
+        if context.object is None:
+            return False
+        
+        obj = context.object
+        gp = get_virtools_groups(obj)
+        active_gp = get_active_virtools_groups(obj)
+        return active_gp >= 0 and active_gp < len(gp)
+    
+    def execute(self, context):
+        # get selected group name first
+        obj = context.object
+        item: BBP_PG_virtools_group = get_virtools_groups(obj)[get_active_virtools_groups(obj)]
+        gname: str = item.group_name
+        # then delete it
+        with VirtoolsGroupsHelper(obj) as hlp:
+            hlp.remove_group(gname)
+        
+        return {'FINISHED'}
+
+class BBP_OT_clear_virtools_groups(bpy.types.Operator):
+    """Clear All Virtools Group for Active Object."""
+    bl_idname = "bbp.clear_virtools_groups"
+    bl_label = "Clear Virtools Groups"
+    bl_options = {'UNDO'}
+    
+    @classmethod
+    def poll(self, context: bpy.types.Context):
+        return context.object is not None
+    
+    def invoke(self, context, event):
+        wm = context.window_manager
+        return wm.invoke_confirm(self, event)
+    
+    def execute(self, context):
+        with VirtoolsGroupsHelper(context.object) as hlp:
+            hlp.clear_all_groups()
+        return {'FINISHED'}
+
+class BBP_PT_virtools_groups(bpy.types.Panel):
+    """Show Virtools Groups Properties."""
+    bl_label = "Virtools Groups"
+    bl_idname = "BBP_PT_virtools_groups"
+    bl_space_type = 'PROPERTIES'
+    bl_region_type = 'WINDOW'
+    bl_context = "object"
+    
+    @classmethod
+    def poll(cls, context):
+        return context.object is not None
+    
+    def draw(self, context):
+        layout = self.layout
+        target = bpy.context.active_object
+        
+        row = layout.row()
+        row.template_list(
+            "BBP_UL_virtools_groups", "", 
+            target, "virtools_groups",
+            target, "active_virtools_groups",
+            rows = 6,
+            maxrows = 6,
+        )
+        
+        col = row.column(align=True)
+        col.operator(BBP_OT_add_virtools_groups.bl_idname, icon='ADD', text="")
+        col.operator(BBP_OT_rm_virtools_groups.bl_idname, icon='REMOVE', text="")
+        col.separator()
+        col.operator(BBP_OT_clear_virtools_groups.bl_idname, icon='TRASH', text="")
+
+#endregion
+
+def register():
+    # register all classes
+    bpy.utils.register_class(BBP_PG_virtools_group)
+    bpy.utils.register_class(BBP_UL_virtools_groups)
+    bpy.utils.register_class(BBP_OT_add_virtools_groups)
+    bpy.utils.register_class(BBP_OT_rm_virtools_groups)
+    bpy.utils.register_class(BBP_OT_clear_virtools_groups)
+    bpy.utils.register_class(BBP_PT_virtools_groups)
+    
+    # add into scene metadata
+    bpy.types.Object.virtools_groups = bpy.props.CollectionProperty(type = BBP_PG_virtools_group)
+    bpy.types.Object.active_virtools_groups = bpy.props.IntProperty()
+
+def unregister():
+    # del from scene metadata
+    del bpy.types.Scene.active_virtools_groups
+    del bpy.types.Scene.virtools_groups
+    
+    bpy.utils.unregister_class(BBP_PT_virtools_groups)
+    bpy.utils.unregister_class(BBP_OT_clear_virtools_groups)
+    bpy.utils.unregister_class(BBP_OT_rm_virtools_groups)
+    bpy.utils.unregister_class(BBP_OT_add_virtools_groups)
+    bpy.utils.unregister_class(BBP_UL_virtools_groups)
+    bpy.utils.unregister_class(BBP_PG_virtools_group)
diff --git a/bbp_ng/PROP_virtools_material.py b/bbp_ng/PROP_virtools_material.py
index 722dc65..80cedf5 100644
--- a/bbp_ng/PROP_virtools_material.py
+++ b/bbp_ng/PROP_virtools_material.py
@@ -77,7 +77,7 @@ g_Annotation_VXCMPFUNC: dict[int, AnnotationData] = {
 
 InheritingIntEnum_t = typing.TypeVar('InheritingIntEnum_t',  bound = enum.IntEnum)
 BlenderEnumPropEntry_t = tuple[str, str, str, str | int, int]
-def generate_vt_enums_for_bl_enumprop(enum_data: type[InheritingIntEnum_t], anno: dict[int, AnnotationData]) -> tuple[BlenderEnumPropEntry_t, ...]:
+def _generate_vt_enums_for_bl_enumprop(enum_data: type[InheritingIntEnum_t], anno: dict[int, AnnotationData]) -> tuple[BlenderEnumPropEntry_t, ...]:
     # define 2 assist functions
     def get_display_name(v: int, fallback: str):
         entry: AnnotationData | None = anno.get(v, None)
@@ -273,7 +273,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     texture_blend_mode: bpy.props.EnumProperty(
         name = "Texture Blend",
         description = "Texture blend mode",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXTEXTURE_BLENDMODE,
             g_Annotation_VXTEXTURE_BLENDMODE
         ),
@@ -283,7 +283,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     texture_min_mode: bpy.props.EnumProperty(
         name = "Filter Min",
         description = "Texture filter mode when the texture is minified",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXTEXTURE_FILTERMODE,
             g_Annotation_VXTEXTURE_FILTERMODE
         ),
@@ -293,7 +293,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     texture_mag_mode: bpy.props.EnumProperty(
         name = "Filter Mag",
         description = "Texture filter mode when the texture is magnified",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXTEXTURE_FILTERMODE,
             g_Annotation_VXTEXTURE_FILTERMODE
         ),
@@ -303,7 +303,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     texture_address_mode: bpy.props.EnumProperty(
         name = "Address Mode",
         description = "The address mode controls how the texture coordinates outside the range 0..1",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXTEXTURE_ADDRESSMODE,
             g_Annotation_VXTEXTURE_ADDRESSMODE
         ),
@@ -313,7 +313,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     source_blend: bpy.props.EnumProperty(
         name = "Source Blend",
         description = "Source blend factor",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXBLEND_MODE,
             g_Annotation_VXBLEND_MODE
         ),
@@ -323,7 +323,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     dest_blend: bpy.props.EnumProperty(
         name = "Destination Blend",
         description = "Destination blend factor",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXBLEND_MODE,
             g_Annotation_VXBLEND_MODE
         ),
@@ -333,7 +333,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     fill_mode: bpy.props.EnumProperty(
         name = "Fill Mode",
         description = "Fill mode",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXFILL_MODE,
             g_Annotation_VXFILL_MODE
         ),
@@ -343,7 +343,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     shade_mode: bpy.props.EnumProperty(
         name = "Shade Mode",
         description = "Shade mode",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXSHADE_MODE,
             g_Annotation_VXSHADE_MODE
         ),
@@ -387,7 +387,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     alpha_func: bpy.props.EnumProperty(
         name = "Alpha Test Function",
         description = "Alpha comparision function",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXCMPFUNC,
             g_Annotation_VXCMPFUNC
         ),
@@ -397,7 +397,7 @@ class BBP_PG_virtools_material(bpy.types.PropertyGroup):
     z_func: bpy.props.EnumProperty(
         name = "Z Compare Function",
         description = "Z Comparison function",
-        items = generate_vt_enums_for_bl_enumprop(
+        items = _generate_vt_enums_for_bl_enumprop(
             UTIL_virtools_types.VXCMPFUNC,
             g_Annotation_VXCMPFUNC
         ),
@@ -612,7 +612,7 @@ def preset_virtools_material(mtl: bpy.types.Material, preset_type: MaterialPrese
     preset_data: MaterialPresetData = g_MaterialPresets[preset_type.value]
     set_raw_virtools_material(mtl, preset_data.mData)
 
-def generate_mtl_presets_for_bl_enumprop() -> tuple[BlenderEnumPropEntry_t, ...]:
+def _generate_mtl_presets_for_bl_enumprop() -> tuple[BlenderEnumPropEntry_t, ...]:
     # define 2 assist functions
     def get_display_name(v: int):
         entry: MaterialPresetData | None = g_MaterialPresets.get(v, None)
@@ -652,7 +652,7 @@ class BBP_OT_preset_virtools_material(bpy.types.Operator):
     preset_type: bpy.props.EnumProperty(
         name = "Preset",
         description = "The preset which you want to apply.",
-        items = generate_mtl_presets_for_bl_enumprop(),
+        items = _generate_mtl_presets_for_bl_enumprop(),
     )
     
     @classmethod
@@ -755,8 +755,10 @@ g_BldClasses: tuple[typing.Any, ...] = (
 )
 
 def register():
-    for cls in g_BldClasses:
-        bpy.utils.register_class(cls)
+    bpy.utils.register_class(BBP_PG_virtools_material)
+    bpy.utils.register_class(BBP_OT_apply_virtools_material)
+    bpy.utils.register_class(BBP_OT_preset_virtools_material)
+    bpy.utils.register_class(BBP_PT_virtools_material)
     
     # add into material metadata
     bpy.types.Material.virtools_material = bpy.props.PointerProperty(type = BBP_PG_virtools_material)
@@ -765,5 +767,7 @@ def unregister():
     # del from material metadata
     del bpy.types.Material.virtools_material
 
-    for cls in g_BldClasses:
-        bpy.utils.unregister_class(cls)
+    bpy.utils.unregister_class(BBP_PT_virtools_material)
+    bpy.utils.unregister_class(BBP_OT_preset_virtools_material)
+    bpy.utils.unregister_class(BBP_OT_apply_virtools_material)
+    bpy.utils.unregister_class(BBP_PG_virtools_material)
diff --git a/bbp_ng/__init__.py b/bbp_ng/__init__.py
index f04470f..148be0b 100644
--- a/bbp_ng/__init__.py
+++ b/bbp_ng/__init__.py
@@ -23,7 +23,7 @@ if "bpy" in locals():
 
 #endregion
 
-from . import PROP_preferences, PROP_virtools_material, PROP_ballance_element
+from . import PROP_preferences, PROP_virtools_material, PROP_ballance_element, PROP_virtools_group
 from . import OP_IMPORT_bmfile, OP_EXPORT_bmfile, OP_IMPORT_virtools, OP_EXPORT_virtools
 from . import OP_UV_flatten_uv, OP_UV_rail_uv
 
@@ -87,6 +87,7 @@ def register() -> None:
     PROP_preferences.register()
     PROP_virtools_material.register()
     PROP_ballance_element.register()
+    PROP_virtools_group.register()
 
     OP_IMPORT_bmfile.register()
     OP_EXPORT_bmfile.register()
@@ -125,6 +126,7 @@ def unregister() -> None:
     OP_EXPORT_bmfile.unregister()
     OP_IMPORT_bmfile.unregister()
 
+    PROP_virtools_group.unregister()
     PROP_ballance_element.unregister()
     PROP_virtools_material.unregister()
     PROP_preferences.unregister()
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