Tag editing in a WPF TextBox

Question

I want to implement a custom TextBox that will allow me to edit tags. Hotmail's "To" TextBox is the best example I can think of:

Also Facebook's "To" implements the same concept:

Oh yeah, and StackOverflow does it too to tag a question :)

Does anyone have some experience in building something like that in WPF? What would be the first steps that I should make?

Answer 1

I believe this Tokenizing control does most of what you're looking for:

http://blog.pixelingene.com/2010/10/tokenizing-control-convert-text-to-tokens/