Animated Flash Component Scaling when used as Button Skin

Question

I am trying to skin the overSkin of a Flex Button component with an animated Flash .swc component. (Actually, an Accordion Header, but for all practical purposes the same.)
All works completely fine, in most cases.  The problem I run into is when I have any objects in the Flash animation moving on and off stage.  When this happens, although the objects cannot be seen when moved off-stage, the viewable area of the Flash animation scales down in either direction, or both, to make room in the button for the objects off stage.
If I play the animation directly in the application, or a Canvas, everything works fine and no scaling occurs.  But for a Button, where I really need it, I get the constant scaling back and forth as the Flash movie runs.  This can be REALLY annoying when trying to click on a button! (Or you find that you are no longer "over" the button (because it scaled down) so you get flicker back and forth between the Up and Over states.)
Any ideas on how I can keep this from happening, either on the Flash or Flex side would be much appreciated.
Pertinent Code:
[Bindable]
[Embed(source="assets//btn_StaticHollywood.jpg")]
private var Film:Class;
[Bindable]
[Embed(skinClass="fc.HollywoodWithSearchlights")]
private var FilmOver:Class;
animatedButton.setStyle("upSkin", Film);
animatedButton.setStyle("overSkin", FilmOver);
<mx:Button id="animatedButton" cornerRadius="0" />
Note: I tried all assortments of setting dimensions I believe.
Remember, the Flash component has objects that move in and off the stage from both directions, and this is the cause of the automatic resizing of the Button when it runs.

Answer 1

I am assuming that you are using Flex 4 and this does not work. In Flex 4, the default theme used is the "Spark" theme. In Flex 3, we used the "Halo" theme. The Halo theme supports styles like borderStyle, but, the Spark theme does not.
If you want to use these styles, you will need to compile with the Halo theme. You can do this by adding an additional compiler argument -theme=<SDK_DIR>/frameworks/themes/Halo/halo.swc (point to the halo.swc in your SDK installation)
Joan