Hi Juerg,
In this scenario, the TabStrip containers will always overlay the fixed tab buttons ("headers"), because the
page is scrolled and all non-fixed page content moves.
Normally, such scenarios are handled by removing the page scrollbar, adjusting the TabStrip height on window.resize, and scrolling the TabStrip containers instead of the page.
http://jsfiddle.net/dimodi/z0ego29h/
Regards,
Dimo
Telerik
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