Prism View is incorrectly initialized when associated with a region

We have created a SDK sample with a CustomRegionAdapter for the RadTabControl and its implementation can be found in out SDK repository(https://github.com/telerik/xaml-sdk/tree/master/TabControl/PRISM/CustomTabControlRegionAdapter)

Loaded event of the RadTabItem's content is fired twice in WPF.

Declined: The behaviour is caused due to the way how the WPF framework operates with ContentControl and their Content property(the RadTabItem is HeaderedContentControl which derives from ContentControl). The Content property is automatically registered to the LogicalTree when it is set, this is causing the first loaded event to be fired. After a selection is made the RadTabControl inserts/visualizes the Content of its selected RadTabItem in its ContentPresenter, this causes the control to fire its loaded event as it is loaded into the VisualTree.

private void Content_Loaded(object sender, RoutedEventArgs e)
{
	if (VisualTreeHelper.GetParent(sender as DependencyObject) != null)
	{
		// Execute the logic for LoadedEvent.
	}
}

Click event of a Button in the HeaderTemplate is not fired properly when another button outside the tab has IsDefault property set to true

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

Fixed in LIB version: 2014.3.1103

When the RadTabControl AllowDragReorder property is set to True and the control contains multiple rows with tabs, the dragging operation cannot be properly executed and completed.

The TabItem doesn't changes when selected Item in the VS2010 designer.

UPDATE:
The issue is present also in the VS2008 and Blend.

Scrolling in TabStrip does not work well when TabStripPlacement=Left or Bottom and  ScrollMode=Item. Pressing the Scroll Buttons scrolls the entire set of tabs.

Pressing "Tab" key does not change the focus when there are several controls in a TabItem.

SelectedItem does not respect the Reset collection changed action.

In the VS2010 designer the selected tab is the last one even if the SelectedIndex proeprty of the TabControl is set to 0. The issue can be reprodiced in a scenario where the RadTabControl is defined in a RadWindow control.

Add a visual state for the selected tab item representation in the DropDown menu of the TabControl.

Exceptions are occuring on ALL bindings, not just with RelativeSource

Command="{Binding AddCommand}"

will also raise an exception.

Using  ArcGIS API for Silverlight/WPF version 2.1 in the TabControl throws exception in design-time

The TabControl ScrollMode property doesn't work as expected when set to "Item"

If you define two UserControls in a project and you add two RadTabControls - one RadTabControl per UserControl, then in design-time you can only change the selection of one of the tab components.

Can't apply transitions when changing the visual state of the RadTabControl or its items

The CommonStates of the control aren't applied and this is why you can't add any storyboards for the normal and disabled state of the control.