WPF Masked Textbox with a value that does not contain mask

I need a WPF Textbox that displays a phone number as "(555) 555-5555" but has a value of "5555555555".

All of the examples I'm seeing have the ability to mask the control on the UI but that affects the bound property of my view model so that the property value has the extraneous ()- characters.

Solution

How about an IValueConverter?

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