I am implementing a tab control using ASP menu and multiview controls. the tab control is placed in AJAX UpdatePanel. All are standard .NET controls. Everything works fine when I test the page using visual studio. But when the page(usercontrol) is housed in Sitefinity. There are many problems. The major problem is the tabs (only tabs not the panel - menu control) disappears when there is a javascript call. I have a password field in the one of multiview panels and it has a OnkeyUp linked to a javascript function. Whenever anything is entered in that password field, the menu disappears. I also observed the tabs disappear when there is validationsummary displayed on validation fail. So i am guessing it has to do with javascript calls. Also this behavior is only observed in IE 6 and 7. It works find in IE 8 and this problem is also absent in FF.