In DockingManager, the ContextMenu items can be hidden by using CollapseDefaultContextMenuItems property. For example, ContextMenu has five menu items (Floating, Dockable, Tabbed, Auto Hide, and Hide) as default. Now, Tabbed menu item can be hidden by setting ShowTabbedMenuItem to False in XAML or by its Name as Child3 in Code behind with the help of SetShowTabbedMenuItem method.
The following screenshot displays the hidden tabbed menu item on child3.
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