title: How to alter the behavior of the X button in the Windows.UI.Xaml.Controls.TextBox?
body: <p>I need to be able to show a warning popup when the user presses the "X" button in a TextBox and clear the text only if the user responds "Yes".</p>
  
  <p>I am not able to find an event specifically for detecting this button click.</p>
  
  <p>Is there a way I can alter the default behavior of the X button if I inherit from the TextBox class?</p>