I am using the themed group box and was expecting it to look like a tabbed container .But it looks like a regular panel

I was expecting it to look like

I was using the defaultapplicationtheme to set the theme for the project. Later i removed it to see if that was causing the groupbox to render like a panel..Not sure now what could be causing this.

Thank you all for the quick responses..I was able to make it work. It was somehow caching the theme settings.So in the solution preferences i first selected a random theme and then i selected "No Application Theme". That i think cleaned the cache and the groupbox was back to default after that.