displaying a drop down for State in back end profile

How can I display a drop down selection for States in the edit mode of a user profile?

I did figure out how to add a text field called "State" to the Basic Profile, and then add a drop down selector to the registration control template.  The registration does save the value into the profile field "State", however, when editing that profile, it is still a text box and not a drop down. Is it possible to display the drop down?
Thank you.