对话框类中添加消息函数(Messages) WM_OnContextMenu
 afx_msg void OnContextMenu(CWnd* /*pWnd*/, CPoint /*point*/); //函数声明

 void CBarView::OnContextMenu(CWnd* /*pWnd*/, CPoint /*point*/) //函数体
 {
  // TODO: Add your message handler code here
  CMenu menu;
  menu.LoadMenu(IDR_RIGHTMENU);
  CMenu* pop=menu.GetSubMenu(0);
  POINT ptMouse;
  GetCursorPos(&ptMouse);
  pop->TrackPopupMenu(TPM_LEFTALIGN|TPM_LEFTBUTTON,ptMouse.x,ptMouse.y, this);

 }