title: Align control on the right in grid
body: <p>I have a grid with 3 columns:</p>
  
  <pre><code>&lt;Grid.ColumnDefinitions&gt;
   &lt;ColumnDefinition Width="Auto" /&gt;
   &lt;ColumnDefinition Width="*" /&gt;
   &lt;ColumnDefinition Width="Auto" /&gt;
  &lt;/Grid.ColumnDefinitions&gt;
  </code></pre>
  
  <p>I want to have the last column align on the right, near to edge of screen.
  Currently, the third column occurs soon after the second. I don't want to pass width in pixels, rather automatic calculation.</p>
  
  <p>I have tried to use on the element in third column property HorizontalAlignment="Right", but unfortunately it's not working.</p>