An application sends a ZGM_ENABLEROWSIZING message to enable or disable the users ability to adjust the row heights in the ZeeGrid. This can only be done when ZGM_SHOWROWNUMBERS is enabled. The cell in the column header row above the row numbers is the trigger for this action. When enable row sizing is enabled the mouse cursor will change to a row resizing icon and the user can click and drag the mouse to change the row heights.
wParam = (WPARAM) (BOOL) fEnable; //enable flag
lParam = 0; //not used; must be zero
This message does not return a value.