In order to achieve this look, you will have to edit the template of the PaneGroup. You can do this very easy in Expression Blend. Just drop a Docking control on the design surface, right-click it and choose from the menu Edit Template->Edit a Copy
. Do this also for the PaneGroup. That will generate all the needed resources.
Once you have the resources of the Docking find the ControlTemplate with x:Key="PaneGroupDocumentTemplate"
. There you have to set the HorizontalAligment
property of the ItemsPresenter with x:Name="ItemsPresenterElement"
. That will align the tabs of the DocumentHost.
In this template also is the Close button and there next to it you can add the toggle button.
Hope this information helps.
the Telerik team
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