Resize effect bug?

Question

In the mxml file below, if you click 'Expand' the red box on
the right uses a Resize effect to grow, but it ends up expanding
way off the screen (producing a scrollbar in the application window
briefly). Since I have specified 'absolute' layout, shouldn't the
Resize effect respect the 'right="0"' constraint and expand the red
box to the left instead of to the right?
Is there another way of doing this?
<?xml version="1.0" encoding="utf-8"?>
<mx:Application xmlns:mx="
http://www.adobe.com/2006/mxml"
xmlns="*"
layout="absolute"
width="100%" height="400" backgroundColor="yellow" >
<mx:Script><![CDATA[
import mx.effects.Resize;
private var resize:Resize = new Resize();
private function expand():void
resize.target = right_box;
resize.heightBy = 0;
resize.widthTo = this.width;
resize.duration = 1000;
resize.play();
]]></mx:Script>
<mx:HBox id='left_box' width="200" height="100%" left="0"
backgroundColor="blue" />
<mx:HBox id='right_box' width="200" height="100%"
right="0" backgroundColor="red" >
<mx:Button label="Expand" click="expand()" />
<mx:Button label="Contract" click="right_box.width=200;"
/>
</mx:HBox>
</mx:Application>

Answer 1

Well, I suppose we could add support to resize to tell it to
move as well as resize, but we're not setup that way. You can add a
move effect that will do what you want.
Objects that are affected by effects don't listen to
constraints and such because otherwise those things could block the
effect.