| BCGCBPRODLLEXPORT UINT BCGM_DIAGRAM_POS_SIZE_CHANGED | 
The message is sent to the parent of CBCGPDiagramVisualContainer class when the diagram item has been moved or resized.
| wParam | a pointer to CBCGPDiagramVisualContainer object that sends a message. | 
| lParam | This parameter is not used. |