title: Binding 3 visibility to one
body: <p>I'm working on WPF mvvm project.I designed a stack-panel that contain 3 label. each label has its visibility. i want to set the visibility of panel hidden when all 3 labels are hidden. </p>
  
  <pre><code>        &lt;StackPanel Visibility="{Binding cond1 || cond2 || cond3}"  &gt;
            &lt;Label Visibility="{Binding cond1}" Content="1"/&gt;
            &lt;Label Visibility="{Binding cond2}" Content="2"/&gt;
            &lt;Label Visibility="{Binding cond3}" Content="3"/&gt;
          &lt;/StackPanel&gt;
  </code></pre>
  
  <p>how can i do it.
  thanks</p>