partial void DeleteItemGroup(ItemGroup instance);
 partial void InsertItemGroup(ItemGroup instance);
 partial void UpdateItemGroup(ItemGroup instance);
		private void attach_ItemGroups(ItemGroup entity)
		{
			this.SendPropertyChanging();
			entity.RootGroup = this;
		}
		private void detach_ItemGroups(ItemGroup entity)
		{
			this.SendPropertyChanging();
			entity.RootGroup = null;
		}
 partial void DeleteItemGroup(ItemGroup instance);
 partial void UpdateItemGroup(ItemGroup instance);
 private void detach_ItemGroups(ItemGroup entity)
 {
     this.SendPropertyChanging();
     entity.RootGroup = null;
 }
 private void attach_ItemGroups(ItemGroup entity)
 {
     this.SendPropertyChanging();
     entity.RootGroup = this;
 }
 partial void InsertItemGroup(ItemGroup instance);