When a label is placed inside a fixed width container, if the content for the label excceds the width, trancting text is not working, even if we set label width=100%.For this we have to give minwidth=0 for label.
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml" layout="absolute">
<mx:HBox width="100" horizontalScrollPolicy="off">
<mx:Label minWidth="0" width="100%" text="Lorem ipsum dolor sit amet, consectetur adipiscing elit. Mauris suscipit metus at mauris convallis egestas. Nullam non nunc eros, ut fringilla quam. Sed id turpis massa, convallis pellentesque elit. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus."/>
</mx:HBox>
</mx:Application>
