Spark CheckBox and Spark RadioButton look terrible when sporting an errorString

Found in 4.0.0.13316

Steps to reproduce:
1. Compile and run attached MXML file.
2. Note the odd "leaking" of the red error string rect from the checkbox and radiobutton icons.

Actual Results:
The error string is about 1-2px too far on the right edge.

Expected Results:
It should look acceptable. It currently doesnt.

Workaround (if any):
Use the mx:CheckBox and mx:RadioButton instead if you need errorString support.