I have a button that is used to navigate to a page to register new users. 
 I would like to have the button's visibility property to be controlled by a column in the user database named admin. 
 if the admin column for the logged in user has the string "admin" in it, set the button's visibility to true. 
 A null field would set it to false. 
 The button is not mapped to anything. 
 I do have a getuser service for the verify page. 
 What is the best approach to making this work. 
 Thanks for any info.