class CWyWnd: public CFrameWnd
{
protected:
    afx_msg void OnRButtonUp(UINT Flags,CPoint point);
};
BEGIN_MESSAGE_MAP(CMyWnd,CFrameWnd)
    ON_WM_RBUTTONUP()
    ON_WM_PAINT()
END_MESSAGE_MAP()void CMyWnd::OnRButtonUp(UINT Flags,CPoint point)
{
char* mess="Bresenham";
MessageBox(mess);
}问题是只有BEEP声,没有出现对话框,主窗口也失去焦点了
怎么会这样啊