Check box text does not become bold when font-weight: bold in used in css

Steps to reproduce:
1. Create a flex project in FB and drag and drop a few components on the design view
2. Create a mx:Checkbox
3. Use Appearance panel and make all text bold using the Bold button.

Actual Results:
css is created
/* CSS file */
@namespace s "library://ns.adobe.com/flex/spark";
@namespace mx "library://ns.adobe.com/flex/mx";
global

All component text except for mx:Checkbox becomes bold

Expected Results:
All component text should become bold

Workaround (if any):