title: WPF Border Thickness increase direction
body: <p>Hey. Another WPF question. In my XAML code I have a border:</p>
  
  <pre><code>&lt;Border x:Name="myBorder" Background="AliceBlue" 
      Width="200" Height="200" 
      BorderThickness="10" BorderBrush="Black"&gt;
  &lt;/Border&gt;
  </code></pre>
  
  <p>and somewhere in code I increase the BorderThickness</p>
  
  <pre><code>double thickness = myBorder.BorderThickness.Bottom + 2;
  myBorder.BorderThickness = new Thickness(thickness);
  </code></pre>
  
  <p>and the result is that the border's weight increases but not outside the 200x200 width-height, but inner, decreasing the dimension. Is there a way to do the opposite?</p>