In MFC Programming, I Override the PreTranslateMessage to handle the RCLICK message From CTreeCtrl,But i have some problem.

See more:

C++

Windows

MFC

I override my PreTranslateMessage function in my dialog, but when i right click the CTreeCtrl control the first time, the Menu loaded as i expected, but when i right click the second time, the Menu disappeared. and the third time the menu loaded again, and fourth it disappeared.
i want to understand the mechmanism of the message routing.
the problem code is here.

if(WM_RBUTTONDOWN==pMsg->message)
	{	
		DWORD dwPos = GetMessagePos();
		CPoint point(LOWORD(dwPos), HIWORD(dwPos));

		CMenu menu;
		VERIFY(menu.LoadMenu(IDR_RCLKMENU));
		CMenu *popup=menu.GetSubMenu(0);
		ASSERT(popup!=NULL);
		popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this);
	}
	return CDialogEx::PreTranslateMessage(pMsg);

When i add one line code the problem disappear and works as i expceted.

    if(WM_RBUTTONDOWN==pMsg->message)
{
    DWORD dwPos = GetMessagePos();
    CPoint point(LOWORD(dwPos), HIWORD(dwPos));

    CMenu menu;
    VERIFY(menu.LoadMenu(IDR_RCLKMENU));
    CMenu *popup=menu.GetSubMenu(0);
    ASSERT(popup!=NULL);
    popup->TrackPopupMenu(TPM_LEFTALIGN | TPM_RIGHTBUTTON, point.x, point.y, this);
            return true; // this line make all message routing normal.
}
return CDialogEx::PreTranslateMessage(pMsg);

Thank you all.