function populateMirroring(tab, exti){
    //alert(tab);
    var store = new dojo.data.ItemFileReadStore({
        url: "com.php?r=r_mirroringData"
    });
    var model = new dojox.grid.data.DojoData(null, store, {
        query: {
            distribution: '*'
        },
        clientSort: true
    });
    var structure = {
        noscroll: true,
        cells: [[{
            name: 'Distribution',
            field: "distribution",
            width: "20em"
        }, {
            name: 'Last Try',
            field: "lasttry",
            width: "10em"
        }, {
            name: 'Last Update',
            field: "lastupdate",
            width: "10em"
        }]]
    };
    var grid = new dojox.Grid({
        id: "grid",
        structure: structure,
        model: model,
        autoWidth: true
    });
	//alert(grid);
    tab.setContent(grid.domNode);
    grid.render();

}





---------------------
HTML OUTPUT:

<div id="tabContainerTab0" class="dijitContentPane dijitTabPane" title="" widgetid="tabContainerTab0" style="position: relative; left: 0px; top: 0px; width: 1423px; height: 470px;">
<div id="grid" class="dojoxGrid" role="wairole:grid" hidefocus="hidefocus" tabindex="0" widgetid="grid" style="-moz-user-select: none; width: 1px;">
<div class="dojoxGrid-master-header" dojoattachpoint="headerNode" style="height: 0px;"/>
<div class="dojoxGrid-master-view" dojoattachpoint="viewsNode"/>
<span tabindex="0" dojoattachpoint="lastFocusNode"/>
</div>
</div>