<mx:HBox xmlns:mx="http://www.adobe.com/2006/mxml">
<mx:Script>
<![CDATA[
import mx.core.Container;
import mx.core.UIComponent;
override protected function measure():void
{
super.measure();
var childrenWidth:int = 0;
var childrenHeight:int = 0;
//loop through all children, and determine the
height and width
//of all the children components
for(var i:int = 0; i<this.numChildren; i++)
{
var obj:UIComponent = (getChildAt(i) as
UIComponent);
if(obj is Container)
{
//here we are using the viewMetricsAndPadding
//so that we get any style information
affiliated
//with the child as well as its actual width
childrenWidth +=
Container(obj).viewMetricsAndPadding.left+
Container(obj).viewMetricsAndPadding.right+obj.width;
childrenHeight +=
Container(obj).viewMetricsAndPadding.top+
Container(obj).viewMetricsAndPadding.bottom+obj.height;
}e
else
{
childrenWidth += obj.width;
childrenHeight += obj.height;
}
} //set this components measured height based on our
calculations
measuredHeight = childrenHeight;
measuredWidth = childrenWidth;
}

]]>
</mx:Script>
</mx:HBox>