gistfile1.xsl

<?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/halo"
			   minWidth="1024"
			   minHeight="768"
			   creationComplete="application1_creationCompleteHandler(event)">
	<fx:Script>
		<![CDATA[
			import mx.events.FlexEvent;
			
			protected function application1_creationCompleteHandler(event:FlexEvent):void {
			
			}
			
			protected function eatFoodTrigger_clickHandler(event:MouseEvent):void {
				var food:Border = new Border();
				food.setStyle('backgroundColor', 0x15DCA9);
				food.width = 200;
				food.height = 200;
				
				stomach.addElement(food);
			
			}
		]]>
	</fx:Script>

	<s:Group verticalCenter="0" horizontalCenter="0">
		<s:layout>
			<s:VerticalLayout horizontalAlign="center" />
		</s:layout>

		<s:Label fontSize="24" text="The 100x100 pink/brown body has a stomach inside it.
				 Press eat and the stomach gets 200x200 'food' added to it.
				 I want the body and the stomach to expand to fit the food." width="200">
		</s:Label>

		<s:Border id="body"
				  backgroundColor="0x333333"
				  minWidth="100"
				  minHeight="100"
				  borderColor="0xFF4466"
				  borderWeight="5">
			<s:Group id="stomach">
			</s:Group>
		</s:Border>

		<s:Button id="eatFoodTrigger" click="eatFoodTrigger_clickHandler(event)" label="eat" />
	</s:Group>
</s:Application>