| BCGCBPRODLLEXPORT UINT BCGM_GRID_ITEM_DBLCLICK | 
The framework sends the BCGM_GRID_ITEM_DBLCLICK message when a user double click inside the grid row.
| wParam | This parameter is not used. | 
| lParam | a pointer to clicked grid control item (CBCGPGridItem). | 
This message is sent to owner of Grid Control when a user double click inside the grid row.