title: Extended Toolkit's NumericUpDown in hex output
body: <p>I am using the Extended Toolkit for WPF.</p>
  
  <p>The NumericUpDown control is capable of inputting hex values, but I cannot see a method/property for showing values in hex format.</p>
  
  <p>There is a FormatString, but this contains thinks like currency, percentage, not hex format.</p>
  
  <p>The code in WPF I have now is:</p>
  
  <pre><code>&lt;xctk:IntegerUpDown Value="{Binding Value}" 
       ParsingNumberStyle="HexNumber" FormatString="%X" Margin="4" /&gt;
  </code></pre>