
<mx:VBox xmlns:mx="http://www.adobe.com/2006/mxml" width="100%" height="100%" >

<mx:TabNavigator id="myTabN" width="100%" height="100%" tabOffset="440">
    <mx:HBox label="Tab1"><mx:TextInput text="some text"/></mx:HBox>
    <mx:HBox label="Tab2"><mx:TextInput text="some text1"/></mx:HBox>
</mx:TabNavigator>
    
</mx:VBox>