| BCGCBPRODLLEXPORT const UINT BCGM_GANTT_CONTROL_WRITE_ITEM_DATA_TO_GRID | 
This message is sent when the chart item data must be synchronized with grid.
| wParam | This parameter is not used. | 
| lParam | pointer to BCGP_GANTT_CONTROL_ROW struct | 
Read from grid cells and write to specified Gantt item in message handler.