How to access a control from a ContextMenu menuitem via the visual tree?

This is happening because DataContext="{Binding PlacementTarget,... binding would set the button as MenuItems DataContext but that won't add the ContextMenu to the VisualTree of your window and that's why Elementname binding's won't work. A simple workaround to use ElementName bindings is to add this in your Window/UserControl's code-behind.

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