this is a bug or my code is wrong?

<html>

<head>

    <title>ActiveWidgets Grid :: Examples</title>

    <style> body, html {margin:0px; padding: 0px; overflow: hidden;} </style>



    <!-- ActiveWidgets stylesheet and scripts -->

    <link href="../../runtime/styles/xp/aw.css" rel="stylesheet" type="text/css" ></link>

    <script src="../../runtime/lib/aw.js"></script>



    <!-- grid format -->

    <style>

        .aw-grid-control {height: 100%; width: 100%; border: none; font: menu;}



        .aw-column-0 {width:  80px;}

        .aw-column-1 {width: 200px; background-color: threedlightshadow;}

        .aw-column-2 {text-align: right;}

        .aw-column-3 {text-align: right;}

        .aw-column-4 {text-align: right;}



        .aw-grid-cell {border-right: 1px solid threedshadow;}

        .aw-grid-row {border-bottom: 1px solid threedlightshadow;}

    </style>

</head>

<body>

    <script>



    //    create ActiveWidgets data model - XML-based table

    var table = new AW.XML.Table;



    //    define data formats

    var str = new AW.Formats.String;

    var num = new AW.Formats.Number;



    table.setFormats([str, str, num, num, num]);



    //    provide data URL

    table.setURL("../data/companies-simple.xml");



    //    start asyncronous data retrieval

    table.request();



    //    define column labels

    var columns = ["Ticker", "Company Name", "Market Cap.", "$ Sales", "Employees"];



    //    create ActiveWidgets Grid javascript object

    var obj = new AW.UI.Grid;



    obj.setColumnCount(5);



    //    provide column labels

    obj.setHeaderText(columns);



    //    enable row selectors

    obj.setSelectorVisible(true);

    obj.setSelectorText(function(i){return this.getRowPosition(i)});

    obj.setSelectorWidth(25);



    //    set row selection

    obj.setSelectionMode("single-row");



    //    provide external model as a grid data source

    obj.setCellModel(table);



    //    write grid html to the page

    //document.write(obj);



             

    var panel = new AW.HTML.SPAN;

    panel.setContent("grid",obj);

    document.write(panel);



    </script>

</body>

</html>

you may copy the code and run in browser,click the row and the row will missing,but i change this

panel.setContent("grid",obj);

panel.setContent("grid",obj.toString());

and it will work well

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