An application sends a ZGM_GETFIXEDCOLUMNS message to get the number of fixed columns in the ZeeGrid.
ZGM_GETFIXEDCOLUMNS
wParam = 0; //not used; must be zero
lParam = 0; //not used; must be zero
The number of fixed columns in the ZeeGrid.
The return value will be the same value as the lParam in the ZGM_DIMGRID message function.