title: How can I animate the properties of a GeometryDrawing?
body: <p>I'm trying to make a fancy blinking icon and animate the brush of a GeometryDrawing and can not figure out how to do this.  Is it possible?</p>
  
  <p>Here is some base xaml</p>
  
  <pre><code>&lt;Window.Resources&gt;
       &lt;GeometryDrawing x:Key="_geometryTest" Brush="#FF6C897B"  Geometry="F1 M 66,188L 194,60L 322,188L 250.889,188L 250.889,348L 137.111,348L 137.111,188L 66,188 Z "&gt;
           &lt;GeometryDrawing.Pen&gt;
              &lt;Pen LineJoin="Round" Brush="#FF000000"/&gt;
          &lt;/GeometryDrawing.Pen&gt;      
       &lt;/GeometryDrawing&gt;
  &lt;/Window.Resources&gt;
  &lt;Grid&gt;
      &lt;Image&gt;
          &lt;Image.Source&gt;
              &lt;DrawingImage x:Name="_myImage" Drawing="{StaticResource _geometryTest}"/&gt;
          &lt;/Image.Source&gt;
      &lt;/Image&gt;
    &lt;/Grid&gt;
  </code></pre>