extjs 弹出windowsurl

function buildWindow(url) {
            var DisplayPanel = new Ext.TabPanel({
            width: 350,
            id:"tt",
                title:"dfsdf",
                height: 500,
                width: 400,
                autoScroll: true,
                activeTab: 0,
                frame: true,
                autoDestroy:false           

            });
            var tan=DisplayPanel.add({
                    id: "ee",
                    title: "sdf",
                    height: 500,
                    width: 400,
                    autoScroll: true,
                    closable: true,                  
                    autoLoad: {
                    showMask: true,
                        url: url,
                        mode: 'iframe',
                        maskMsg: 'Loading ' + '...'
                    }});
             var win = new Ext.Window({
             id:"ww",
             layout: "fit",
             autoScroll:true,
             title: "Source code",
             iconCls: "icon-pagewhitecode",
             width: 600,
             height: 600,
             maximizable: true,
             autoShow: true,
             plain: true,
             resizable: false,
             shadow: false,
             bufferResize: true,
             modal: true,
              items:[DisplayPanel]
                 
             });  
             
     win.show();
 }

 

<ext:Button ID="Button1" runat="server" Text="Submit">
        <Listeners>
            <Click Handler="buildWindow('Default.aspx')" />
        </Listeners>
    </ext:Button>