Skining problem?

Any ideas why this example is failing:

simple test
		<script  src="../dhtmlxGrid/codebase/dhtmlxcommon.js"></script>
		<script  src='../dhtmlxWindows/codebase/dhtmlxwindows.js'></script>	
		<script  src="../dhtmlxLayout/codebase/dhtmlxlayout.js"></script>
		<script  src="../dhtmlxLayout/codebase/dhtmlxcontainer.js"></script>
		<script  src="../dhtmlxTabbar/codebase/dhtmlxtabbar.js"></script>	
<script type="text/javascript">
<!--
var layoutMaster = {};
	  function init()
	  {
				layoutMaster.dhxWins = new dhtmlXWindows();
				layoutMaster.dhxWins.setImagePath("../dhtmlx/dhtmlxWindows/codebase/imgs/");

				layoutMaster.dhxLayoutMain = new dhtmlXLayoutObject(document.body, "2E");
				layoutMaster.dhxLayoutMain.cells("a").setHeight(30);
				layoutMaster.dhxLayoutMain.cells("a").fixSize(false,true);
				layoutMaster.dhxLayoutMain.cells("a").hideHeader();
				layoutMaster.dhxLayoutMain.cells("b").hideHeader();
			
				//Main Tab Things
		        layoutMaster.tabbar=layoutMaster.dhxLayoutMain.cells("b").attachTabbar();
		        layoutMaster.tabbar.setSkin("winscarf");//
				layoutMaster.tabbar.setImagePath("../dhtmlxTabbar/codebase/imgs/");
	            layoutMaster.tabbar.addTab("a1","Queues");
		        layoutMaster.tabbar.setTabActive("a1")

				//Layout things
				layoutMaster.dhxLayout = layoutMaster.tabbar.cells("a1").attachLayout("2U");
				layoutMaster.dhxLayout.cells("a").hideHeader();
				layoutMaster.dhxLayout.cells("b").hideHeader();
				layoutMaster.dhxLayout.cells("a").setWidth(310);

	  }
//-->
</script>

if you have set skin name in the attachLayout method, layout gets the skin from its parent. The tabbar skin is winscarf that is not valid for layout. Therefore, the problem could occur:

layoutMaster.dhxLayout = layoutMaster.tabbar.cells(“a1”).attachLayout(“2U”,“dhx_skyblue”);