title: How can I create a PasswordBox with an input scope that accepts only numbers?
body: <p>This seems like a glaring oversight in Windows Phone. The <code>&lt;PasswordBox /&gt;</code> control doesn't allow for specifying <code>InputScope</code>.</p>
  
  <p>I need to show the <code>PasswordBox</code> as part of a custom password entry screen (e.g. images and buttons), and show a numeric keypad to allow only numeric input.</p>
  
  <p>Coding4Fun's <code>PasswordInputPrompt</code> allows for numeric input but it's not customizable, in that I can't build a custom layout around it, it only allows for <code>Title</code> &amp; <code>Message</code> values.</p>
  
  <p>Is there any way for me to do this? </p>