<com:TContent ID="Content"> <com:TButton ID="Button" Text="Set empty CssUrl" OnClick="onSetEmptyCssUrl"/> <com:TTabPanel ID="TabPanel"> <com:TTabView Caption="View 1"> content for view 1 </com:TTabView> <com:TTabView Caption="View 2"> content for view 2 </com:TTabView> <com:TTabView Caption="View 3"> content for view 3 </com:TTabView> </com:TTabPanel> </com:TContent>