title: showing password characters on some event for passwordbox
body: <p>I am developing a windows phone application.In that i ask the user to login.</p>
  
  <p>On the login page the user has to enter password.</p>
  
  <p>Now what I want is that i give user a check box which when selected should show the characters of the password.</p>
  
  <p>I have not seen any property on password box to show password characters.</p>
  
  <p>Please suggest some way to do it. </p>