XAML - How to add new property to a Button?

In XAML / C# - is it possible to add a custom attribute or property to a <Button/> that is an enumeration?

 

     <Button x:Name="acButton"
                Content="/"
                Margin="5"
                Grid.Row="1"

[b]Kind="Division"[/b]


                Grid.Column="0"/>

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"Kind" would give intellisense (code completion) options of "Addition, Subtraction, Multiplication, Division"

In the C# code behind, something like this:

  public enum SelectedOperator
    {
        Addition,
        Subtraction,
        Multiplication,
        Division
    }

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How do you code it?  Do you inherit from Button?