Thank you for writing.
You can always see the default template with the help of the Reflector tool. You just need to open the Telerik.Windows.Controls.Primitives.dll assembly, navigate to the resources folder and browse for the messagebox.xaml file. When you find it, you can right-click and choose save. This will save the message box theme as a xaml file that you can modify and reuse as you see fit.
Please write again if you have other questions.
the Telerik team
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