I came accross an issue where I was only able to see the first tab. Clicking on any other tab would not work. I isolated the issue to the following:
One of the tabs contained RangeValidators. After removing these, everything started working.
Layout:
RadTabStrip
Tabs
RadMultiPage
RadPageView1
UserControl
RadPageView2
UserControl containing a RangeValidator
RadPageView3
Empty
Note: RequestValidation="false" for this page
No resolution at this point. I just dropped the validation control out of my usercontrol and using my own error presentation methods instead.
One of the tabs contained RangeValidators. After removing these, everything started working.
Layout:
RadTabStrip
Tabs
RadMultiPage
RadPageView1
UserControl
RadPageView2
UserControl containing a RangeValidator
RadPageView3
Empty
Note: RequestValidation="false" for this page
No resolution at this point. I just dropped the validation control out of my usercontrol and using my own error presentation methods instead.