An application sends a ZGM_GETMOUSECOL message to determine the column of the ZeeGrid that the mouse pointer is currently on.
wParam = 0; //not used; must be zero
lParam = 0; //not used; must be zero
The column number that the mouse pointer is currently over. The return value will only be valid when this message is sent in response to a ZeeGrid notification message about a mouse action.
A return value of -1 signifies that the mouse is over an area of the grid that is not a valid column. A return value of 0 signifies the mouse is over the row numbers column.