The ZGN_CELLCLICKED notification message is sent when the mouse is left-clicked on any data cell. The parent window of the ZeeGrid control receives this notification message through the WM_COMMAND message.
ZGN_CELLCLICKED
idZeeGrid = (int) LOWORD(wParam); //identifier of the ZeeGrid control
hwndZeeGrid = (HWND) lParam; //handle to the ZeeGrid control