Add popup menu for right click

It is said that popup menu is one of the great creatures by Microsoft. And it is easy to add the popup menu in your MFC application. In fact, there are only 2 steps you need to do:

1. Create the menu resource for the popup menu, like this:

IDR_MENU1 MENU
BEGIN
POPUP ""
    BEGIN
  MENUITEM "Poisson Image Editing",       ID_DSTVIEW_POISSON
  MENUITEM "Drag and Drop Pasting",       ID_DSTVIEW_DDPASTING
END
END

2. Overwrite the message handler for WM_CONTEXMENU, then it is done.

void CDstView::OnContextMenu(CWnd* /*pWnd*/, CPoint point)
{
      CMenu   popupmenu;
      popupmenu.LoadMenu(IDR_MENU1);
      CMenu*   popup=popupmenu.GetSubMenu(0);
      popup->TrackPopupMenu(TPM_LEFTALIGN,point.x,point.y,this);

}