An application sends a ZGM_GETSELECTEDCOLUMN message to get the currently selected column in the ZeeGrid. If no column is selected, this message will return -1.
ZGM_GETSELECTEDCOLUMN
wParam = 0; //not used; must be zero
lParam = 0; //not used; must be zero
The currently selected column is returned. If no column is currently selected, the message returns -1.