To achieve this you will have to edit the ControlTemplate of the Docking. First create a custom theme for the Docking control using the steps provided here: http://www.telerik.com/help/silverlight/common-styling-apperance-modifying-built-in-theme.html
Once you have the custom theme 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.
Please let us know if you need additional help.
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