如何在VSPackage中检测XAML设计器窗口

using Microsoft.VisualStudio.ComponentModelHost;
using Microsoft.VisualStudio.Shell;
using Microsoft.VisualStudio.Shell.Interop;
using Microsoft.VisualStudio.TextManager.Interop;

protected override void Initialize()
{
    base.Initialize();

    IVsMonitorSelection monitorSelection = GetService(typeof(SVsShellMonitorSelection)) as IVsMonitorSelection;
    if (monitorSelection != null)
    {
        uint cookie = 0;
        monitorSelection.AdviseSelectionEvents(new SelectionEventsHandler(), out cookie);
    }
}

public class SelectionEventsHandler : IVsSelectionEvents
{
    public int OnSelectionChanged(IVsHierarchy pHierOld, uint itemidOld, IVsMultiItemSelect pMISOld, Microsoft.VisualStudio.OLE.Interop.IServiceProvider pSPOld,
        IVsHierarchy pHierNew, uint itemidNew, IVsMultiItemSelect pMISNew, Microsoft.VisualStudio.OLE.Interop.IServiceProvider pSPNew, int fFirstWindow)
    {
        // 判断当前选中的窗口是否为XAML设计器窗口
        if (pHierNew != null && pHierNew.ToString().Contains("XAML Designer"))
        {
            // 执行相关操作
        }
        return VSConstants.S_OK;
    }
}