First insert a menu,Then overload the OnRButtonDown function:
void CPopupView::OnRButtonDown(UINT nFlags,CPoint point)
{
// TODO:Add your message handler code here and/or call default
CMenu popup;
popup.LoadMenu(IDR_MENU1);
CMenu *pop=popup.GetSubMenu(0);
pop->TrackPopupMenu(TPM_RIGHTALIGN,point.x,point.y,this);
CView::OnRButtonDown(nFlags,point);
}