Cannot tab between two custom components based on FxRadioButtonGroup

Steps to reproduce:
1. Create a custom component based on FxRadioButtonGroup
2. Add two of the custom components to a FxApplication
3. Try to tab between the two RadioButtonGroups

Actual Results:
You can't tab into the second RadioButtonGroup

Expected Results:
Tab into the second RadioButtonGroup

Workaround (if any):
None