FxRadioButtonGroup doesnt render correctly after being disabled and enabled

Steps to reproduce:
1. Compile and run attached MXML file
2. Select a FxRadioButton control (note the labels are black)
3. Disable the FxRadioButtonGroup using the CheckBox (note the labels are red/alpha=50% and you cannot select an FxRadioButton).
4. Enable the FxRadioButtonGroup using the CheckBox (note the labels are STILL red but the FxRadioButtons change to from red/alpha=50% to black/alpha=100 after you roll over the FxRadioButton.

Actual Results:
Re-enabling the FxRadioButtonGroup doesnt invalidate the FxRadioButtons

Expected Results:
Setting the enabled property on an FxRadioButtonGroup should invalidate all the FxRadioButton controls

Workaround (if any):