I'm not sure if this is possible, is there a way to get the <mx:Form> to set its own height based on the position of an element within it?

For example something like this:

<mx:Form height="{submitBtn.y + submitBtn.height}">

   <mx:FormItem>... </mx:FormItem>

   <mx:FormItem>... </mx:FormItem>

   <mx:FormItem>... </mx:FormItem>

   <mx:FormItem>
       <s:Button id="submitBtn" label="Submit" /> 
   </mx:FormItem>

</mx:Form>

where the form height is dynamically set based on submitBtn's y position and its height.

I tried using Alert.show to show these values and turned out submitBtn.y = 0 and submitBtn.height = 21. height sounds reasonable, but I know the y of submitBtn can't be 0 since it's below several other

Is it possible to set the form height dynamically?