Form Item - percentage-based hights in formItems cause the swf to hang indefinately.

Steps to reproduce:
1. Build an application with the following form code as its only component :

--------CODE
<mx:Form xmlns:mx="http://www.adobe.com/2006/mxml" paddingLeft="1"
width="100%" height="100%" label="Label" fontSize="9"
verticalGap="1" paddingBottom="1" paddingTop="1" paddingRight="1">

<mx:FormItem width="100%" height="60%" direction="horizontal" indicatorGap="1">

</mx:FormItem>

<mx:FormItem width="100%" height="32%" direction="vertical" indicatorGap="1" verticalGap="2">
<mx:FormHeading label="Availability/Assignment"/>
<mx:Canvas width="100%" height="100%" borderThickness="1" borderColor="#000000" cornerRadius="5" borderStyle="solid">
<mx:Label x="10" y="10" text="Label1:" width="98"/>
</mx:Canvas>
</mx:FormItem>

<mx:FormItem width="100%" height="8%" direction="horizontal">
<mx:Button label="Button" paddingLeft="1" paddingRight="1"/>
</mx:FormItem>

</mx:Form>
--------CODE

2. Launch the debug client after it is built.

Actual Results: After a period of time, the debugger will return the following error:

Error: Error #1502: A script has executed for longer than the default timeout period of 15 seconds.

Expected Results: The form should work as directed and return no error

Workaround (if any): Replacing the height attributes of all formItem's in the above code with an absolute height (any number will work) will cause the code to run without problems.