title: Working with Arrow Keys in a WPF Textbox (C#)
body: <p>Is there any way to catch the Up/Down arrow keys in a WPF TextBox (<code>System.Windows.Controls.Textbox</code>) and allow them to alter the text? I've read about overiding the <code>ProcessCmdKey</code> method for a Windows Forms TextBox (<code>System.Windows.Forms.TextBox</code>), and it worked fine, but that <code>TextBox</code> is not nearly as flexible as the WPF one. Is there a similar method to accomplish this without having to use the old Windows Forms TextBox?</p>
  
  <p>For my example, I have a TextBox that has a numeric text-mask. I want to be able increase/decrease the numeric value by using the up and down arrow keys.</p>