Email Address User Control

I am trying to replicate the functionality of Microsoft Outlooks' "To, Cc and Bcc" text fields.

These fields have the ability to:
 - Type in new email addresses and check for validity (against existing contact list)
 - Once click selection of an entry with right click options for properties of the contact
 - Add in new addresses by selecting from the contacts form

etc.

The basics I have so far is implemented a class that inherits from System.Windows.Forms.RichTextBox, a struct for the Recipients (Display Name, Address etc), a collection for the recipients and associated methods to add new recipients in etc.  I can also underline entries pretty much although there are a few bugs in it, but It feels clunky to me.

Basically I'm wondering if I'm on a hiding to nothing.  Is this more complicated than it needs to be?  Is a RichTextBox the right control to use?

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