The ZGN_F5 notification message is sent when the F5 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_F5
idZeeGrid = (int) LOWORD(wParam); //identifier of the ZeeGrid control
hwndZeeGrid = (HWND) lParam; //handle to the ZeeGrid control