Two way data binding to FxRadioButtonGroup enabled causes enabled to return false

Steps to reproduce:
1. Compile & run:
<?xml version="1.0" encoding="utf-8"?>
<FxApplication xmlns="http://ns.adobe.com/mxml/2009">
<Declarations>
<FxRadioButtonGroup id="srg" enabled="true"/>
<FxRadioButtonGroup id="srg2" enabled="true"/>
</Declarations>

<Label id="lbl" y="210" text="@

"/>
<Label id="lbl2" y="240" text="

"/>

</FxApplication>

Actual Results:
The first label is false, the second is true.

Expected Results:
Both should be true, both FxRadioButtonGroups are enabled.

Workaround (if any):