The TabControl ScrollMode property doesn't work as expected when set to "Item"
When navigating with tab key (without setting tabindex) first highlights the RadTabItem then its content. Setting a tabindex on a control in the tabItem`s content works the opposite way
Using ArcGIS API for Silverlight/WPF version 2.1 in the TabControl throws exception in design-time
Pressing "Tab" key does not change the focus when there are several controls in a TabItem.