By default, child element of DockingManager (which has state as Document) will be added as content of TabItemExt in DocumentTabControl. To disable the document child element of DockingManager, we must retrieve the TabItemExt element from DocumentTabControl and set IsEnabled as false to the retrieved element. For instance, we have disabled all the items in the DocumentTabControl, except SelectedItem. The following code demonstrate the same,
Code to disable the child element of DockingManager:
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