FB4 vgroup/hgroup prevents effects from occurring

Question

I am using Flash Builder 4 Beta 2 and have run into an issue I can't figure out.  I created a new component that is based on spark.components.Group, Inside that group I define a mx:image and a s:label wrapped in a s:vgroup.  I then have a click handler on the component that will cause the image to bounce up and down when clicked.
Very basic example leaving a lot out like the click hanlder and effect stuff, but easily shows what i am talking about:
<s:group>
     <s:vgroup>
          <mx:image />
          <s:label />
     </s:vgroup>
</s:group>
Now if i click on the component after its been added to another page the image does not perform the bounce effect.  However if I just change the tags of the vgroup to be the old mx:vbox, that s:vgroup replaced, then the effect works beautifly. 
For example:
<s:group>
     <mx:vbox>
          <mx:image />
          <s:label />
     </mx:vbox>
</s:group>
What I am wondering is if this is a beta 2 bug or if I am doing something improperly. If i just make the entire thing vgroup instead of just group then the effect doesn't work either.

Answer 1

Here is my component code, if you put this component onto another page and click it the image will not bounce.  If you then just comment out the S:vgroup section and uncomment the mx:vbox section the image will bounce without any issues.
<?xml version="1.0" encoding="utf-8"?>
<s:Group xmlns:fx="http://ns.adobe.com/mxml/2009"
             xmlns:s="library://ns.adobe.com/flex/spark"
             xmlns:mx="library://ns.adobe.com/flex/halo"
             width="90" height="80"
             click="button_clickHandler(event)">
     <fx:Declarations>
          <s:Bounce id="bounceEase"/>
          <s:Sequence id="seqBounce"  target="{imgMove}" >
               <s:Move yBy="-15" duration="400" />
               <s:Move yBy="15" duration="1000" easer="{bounceEase}"/>
          </s:Sequence>
     </fx:Declarations>
     <fx:Metadata>
          [Event(name="menuButtonClick", type="Events.MenuButtonClick")]
     </fx:Metadata>     
     <fx:Script>
          <![CDATA[
               import Events.MenuButtonClick;
               [Bindable]
               public var labelText:String="";
               [Bindable]
               public var imagePath:String="";
               public var pageName:String="";               
               protected function button_clickHandler(event:MouseEvent):void
                    seqBounce.play();
                    this.dispatchEvent(new MenuButtonClick(MenuButtonClick.MENU_CLICK,false, false,pageName));
          ]]>
     </fx:Script>
<!--     <mx:VBox paddingTop="20" width="100%" height="100%" horizontalAlign="center">
          <mx:Image  id="imgMove" source="{imagePath}"/>
          <s:Label id="lblText" text="{labelText}" />               
     </mx:VBox>-->
     <s:VGroup paddingTop="20" width="100%" height="100%" horizontalAlign="center">
          <mx:Image id="imgMove" source="{imagePath}"/>     
          <s:Label id="lblText" text="{labelText}" />               
     </s:VGroup>
</s:Group>