OM_NEW -- Create PanelGroup object
OM_DISPOSE -- Dispose PanelGroup object
OM_SET -- Set PanelGroup attributes
OM_GET -- Get PanelGroup attributes
MUIM_Group_InitChange -- Begin group changes
MUIM_Group_ExitChange -- End group changes
MUIM_PanelGroup_AddPanel -- Add a panel to tracking
MUIM_PanelGroup_RemovePanel -- Remove a panel from tracking
MUIM_PanelGroup_ScanPanels -- Scan for Panel children
MUIM_PanelGroup_CollapsePanel -- Collapse a specific panel
MUIM_PanelGroup_ExpandPanel -- Expand a specific panel
MUIM_PanelGroup_TogglePanel -- Toggle a panel's state
MUIM_PanelGroup_GetPanelState -- Get panel's current state
MUIM_DragQuery -- Check if drag is accepted
MUIM_DragReport -- Handle drag feedback
MUIM_DragDrop -- Handle drag drop operation
MUIM_DragFinish -- Clean up after drag operation