The ZGN_F8 notification message is sent when the F8 key is pressed in the ZeeGrid contol that has the keyboard input focus. The parent window of the ZeeGrid control receives this notification message through the WM_COMMAND message.
ZGN_F8
idZeeGrid = (int) LOWORD(wParam); //identifier of the ZeeGrid control
hwndZeeGrid = (HWND) lParam; //handle to the ZeeGrid control