Is there an editor for numeric input and constant strings?

I have a textbox in a DataGrid that is bound to an Int32 property. Along with accepting typed numeric input, I want the textbox to handle constant strings, such as MAX.

I know there are many ways I could do this in WPF. I was just wondering if Wpf Studio includes an editor control that might already handle this (accepting numeric input along with constant string names that refer to numeric values). Admittedly, I haven't seen such a control in the Wpf Studio Editors documentation but I just wanted to double check before I made something custom.

Thanks,

-Craig

[Modified at 04/18/2011 08:46 PM]