BCGSuite for MFC
BCGCBPRODLLEXPORT UINT BCGM_GRID_ON_HIDE_COLUMNCHOOSER

The message is sent to owner of Grid Control.

Parameters
wParamThis parameter is not used.
lParamThis parameter is not used.
Returns
The return value is ignored.

This message is sent to owner of Grid Control. when the column (field) chooser has been hidden.