1. Dynamic content issue: Click on a tab with AJAX content, and it loads slow, while it's loading click other tab with AJAX content. You will get 2 opened tabs with loaded content as 2 divs one under another.
2. When you put your tabStrip on very end of your html document and when you want to change its tab at 1st tabStrip toggles active one (that's why html doc shrinks) and shows new one. It's content is below and you have to scroll whole page to see it. You can investigate it even in your demos pages.