R

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009"
			   xmlns:s="library://ns.adobe.com/flex/spark"
			   xmlns:mx="library://ns.adobe.com/flex/mx" minWidth="955" minHeight="600">
	<fx:Declarations>
		<!-- Place non-visual elements (e.g., services, value objects) here -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			import spark.components.NavigatorContent;
			import spark.components.Button;
			var but:Button;
			private function init():void
			{
			var temp1:NavigatorContent = new NavigatorContent();
			temp1.label="as-temp1";

			var temp2:NavigatorContent = new NavigatorContent();
			temp2.label="as-temp2";

			var temp3:NavigatorContent = new NavigatorContent();
			temp3.label="as-temp3";
				tabNav.addElementAt(temp1,1)
			tabNav.addElementAt(temp2,2)
			tabNav.addElementAt(temp3,3)
			tabNav.selectedIndex=2;

			}
		]]>
	</fx:Script>
		<mx:TabNavigator id= "tabNav" creationPolicy="all" x="20" y="100" height="300" width="800" tabWidth="150">
		<s:NavigatorContent id="navg0" label="mxm-temp0" tabIndex="0">
		<s:Label text ="in tab 0"/>
		</s:NavigatorContent>
		<s:NavigatorContent id="navg2" label="mxm-temp4" tabIndex="4">
			<s:Label text= "in tab 4"/>
		</s:NavigatorContent>
	</mx:TabNavigator>
	<s:Button click="init()"/>
</s:Application>