Groups are not sized properly when nested.

Steps to reproduce:
1. create the following component

package fs.groups
{
import spark.components.Group;
public class Group extends spark.components.Group
{
public function Group()

{ super(); }

override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void

{ super.updateDisplayList(unscaledWidth, unscaledHeight); trace("unscaled*:", unscaledWidth, unscaledHeight); trace("getExplicitOrMeasured*:", getExplicitOrMeasuredWidth(), getExplicitOrMeasuredHeight()); }

}
}

2. create the following application

<?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"
xmlns:groups="fs.groups.*">

<s:Group height="400" width="400">
<groups:Group id="fs" height="100%" width="100%" />
</s:Group>

</s:Application>

3. compile

Actual Results:

The trace log:
unscaled*: 400 400
getExplicitOrMeasured*: 0 0

I would expect the group to be as big as the container, since it is expressed in MXML.

Expected Results:
unscaled*: 400 400
getExplicitOrMeasured*: 400 400

Workaround (if any):
none