It seems that there is a problem on FORMS and TABPANELS when you use a SpecialMatte with a rounding radius OR a RoundedWebBorder with a rounding radius OR a style with the border-radius property.
The rounded part doesn't show up. Tried in Chrome, Firefox, IE 11... anyone come up with a workaround (besides using a label as a "backer")?
This is Developer 7.2 (build 2013), Windows 7, Java 1.7.0_45, Chrome