title: Silverlight - I need to know Selected Text in a PasswordBox
body: <p>I'm building a complex change password form, but I need a simple task to continue my work:
  I need to know what text is selected in a PasswordBox.
  I know how to do it in TextBox components, using SelectedText, but I can't in a PasswordBox.</p>
  
  <p>Have you some solutions to this problem?
  Thank you</p>