I am afraid this could not be accomplished with the RadDocking control. The RadPane represents the small tab and its content is placed in the RadPaneGroup. When a pane is unpinned, it's placed into an autohide area and when the tab is hovered, its content is shown via a popup. This is how the RadDocking works in this scenario. Please, refer to our online documentation for more information - http://www.telerik.com/help/silverlight/raddocking-visual-structure.html.
the Telerik team
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