title: WPF Trigger that would work if the value is equal or greater
body: <p>I wrote an application in WPF that has a button and slider. I would like to create  a trigger for the button, which would set the button's 'IsEnable' property to false when the slider value is <strong>greater</strong> than another value. 
  Right now I have:</p>
  
  <pre><code>&lt;Style x:Key="zoomOutButton" TargetType="Button" BasedOn="{StaticResource ResourceKey=buttonStyle}"&gt;
          &lt;Style.Triggers&gt;
              &lt;DataTrigger Binding="{Binding CurrentAltitude}" Value="24000"&gt;
                  &lt;Setter Property="IsEnabled" Value="False" /&gt;
              &lt;/DataTrigger&gt;
          &lt;/Style.Triggers&gt;
      &lt;/Style&gt;
  </code></pre>
  
  <p>But I would like to set isEnable not when the value of CurrentAltitude equal 24000, but when it is equal or greater than 24000. 
  Any ideas?</p>