protected void btnClose_Click(object sender,EventArges e)

 {

      PageContent.RegisterStartupScript(ActiveWindow.GetHidePostBackReference(Name+":2"+Value))//传多个值

 }

 protected void Window1_Close(object sender, ExtAspNet.WindowCloseEventArgs e)

 {

    string strValue=e.CloseArgument;//获取子窗体的传值

    string[] values;

    if(strValue.IndexOf(":")>-)

   {

       values=strValue.Sqlit(':');//取多个值，到数组。

   }

 }

<ext:Window ID="Window1" Title="弹出窗体" runat="server" target="Top" IsModal="True" Width="650px" EnableConfirmOnClose="false" 
     Height="200px" EnableMaximize="true" EnableIFrame="true" Popun="false" IFrameURl="about:blank">

</ext:Window>

<ext:Pagemanager AutoSizePanelID="btnClose" ID="Pagemanager1" AjaxAspnetControls="TreeView1" ruant="server"></ext:Pagemanager>

<ext:Button ID="btnClose" ruant="server" onclick="btnClose_Click" Icon="SystemClose" >