WPF: How to style or disable the default ContextMenu of a TextBox

To style ContextMenu’s for all TextBoxes, I would do something like the following:

First, in the resources section, add a ContextMenu which you plan to use as your standard ContextMenu in a textbox.
e.g.

<ContextMenu x:Key="TextBoxContextMenu" Background="White">
  <MenuItem Command="ApplicationCommands.Copy" />
  <MenuItem Command="ApplicationCommands.Cut" />
  <MenuItem Command="ApplicationCommands.Paste" />
</ContextMenu>

Secondly, create a style for your TextBoxes, which uses the context menu resource:

<Style TargetType="{x:Type TextBox}">
  <Setter Property="ContextMenu" Value="{StaticResource TextBoxContextMenu}" />
</Style>

Finally, use your text box as normal:

<TextBox />

If instead you want to apply this context menu to only some of your textboxes, do not create the style above, and add the following to your TextBox markup:

<TextBox ContextMenu="{StaticResource TextBoxContextMenu}" />

Hope this helps!