Why radio button doesn't show properly in mac os x

I have view where is two radio buttons (optiongroup) and this group is inside vertical layout where margin is true (intended). This view doesn’t properly in mac os x (leopard). Part of radio button is invisible (left side).
Is it there any workaround fix this.

Sounds like a bug. If you have a test case for this, please create a ticket at
and attach the test case.