title: Collection Dependency Property not working
body: <p>I have a WPF User Control representing a Circular Gauge with some properties in it. When I Directly use it in my application everything works just fine but when I load it in Expression Blend in order to test its properties and simulate the expected animations it works expect collection dependency  properties. The problem is when I use Expression Blend to add some item to the collection property 
  The “SetValue” is not called! What am I doing wrong?</p>
  
  <pre><code>    public static readonly DependencyProperty RangesProperty =
          DependencyProperty.Register("Ranges ", typeof(CircularRangeInfoList), typeof(UserControl1), new FrameworkPropertyMetadata(new CircularRangeInfoList()));
  
      [Category("Test Collection")]
      public CircularRangeInfoList Ranges
      {
          get { return (CircularRangeInfoList)GetValue(RangesProperty); }
          set { SetValue(RangesProperty, value); }
      }
  public class CircularRangeInfoList : ObservableCollection&lt;CircularRangeInfo&gt;
  {
      public CircularRangeInfoList()
      {
      }
  }
  </code></pre>