如何为SDI程序中多个不同视图路由命令消息

具体见图：

图片中代码不太清楚，贴在这里：

BOOL CMainFrame::OnCmdMsg(UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{
	if (pDoc)
		return pDoc->RouteCmdAllViews(GetActiveView(), nID, nCode, pExtra, pHandlerInfo);

	if(CFrameWnd::OnCmdMsg(nID, nCode, pExtra, pHandlerInfo))
		return TRUE;
	return FALSE;
}

BOOL CDemoDoc::RouteCmdAllViews(CView* pActiveView, UINT nID, int nCode, void* pExtra, AFX_CMDHANDLERINFO* pHandlerInfo)
{
	POSITION pos = GetFirstViewPosition();
	CView* pNextView = NULL;
	while (pos)
	{
		pNextView = GetNextView(pos); //pos is a reference, will be set to NULL when final view returned
		if (pNextView != pActiveView)
		{
			if (pNextView->OnCmdMsg( nID,  nCode,  pExtra,  pHandlerInfo))
				return TRUE;
		}
	}
	return FALSE;
}