title: Bind visibility property to a variable
body: <p>I have a <code>Border</code> with <code>Label</code> inside a <code>Window</code>,</p>
  
  <pre><code>&lt;Border x:Name="Border1" BorderBrush="Black" BorderThickness="1" HorizontalAlignment="Left" Height="21" Margin="229,164,0,0" VerticalAlignment="Top" Width="90" Opacity="0.5"&gt;
      &lt;Grid&gt;
          &lt;Label Content="test"/&gt;
      &lt;/Grid&gt;
  &lt;/Border&gt;
  </code></pre>
  
  <p>I have also a <code>Variable</code>:</p>
  
  <pre><code>public bool vis = false;
  </code></pre>
  
  <p>How could I bind the <code>vis</code> variable with border <code>Visibility</code> property?</p>