绑定矩形几何体。矩形不显示矩形

  <Path x:Name="_value" Fill="{DynamicResource PositiveColorBrush}" Data="F1 M10,55 C10,57.75 7.75,60 5,60 2.25,60 0,57.75 0,55 L0,5 C0,2.25 2.25,0 5,0 7.75,0 10,2.25 10,5 L10,55 z">
     <Path.Clip>
        <!-- SECOND NUMBER CONTROLS THE HEIGHT : SCALE OF 0-60 REVERSED -->
        <!--<RectangleGeometry Rect="0,22.82,10,60"/>-->
        <RectangleGeometry 
           Rect="{Binding Score, Converter={StaticResource ChartBarScoreConverter}}" />
     </Path.Clip>
  </Path>

请注意此处注释的矩形几何体。当我取消对它的注释并注释掉绑定的矩形几何体时,这种方法非常有效。当然,它不会随着分数的变化而改变大小。

  ...
  public object Convert(object value, Type targetType, object parameter, System.Globalization.CultureInfo culture)
  {
     RectangleGeometry output = new RectangleGeometry();
     double score = 60; //0
     if (Common.IsNumeric(value))
     {
        score = System.Convert.ToDouble(value) * .60;//scale is 0-60
        score = 60 - score;//reversed (=
     }
     output.Rect = new Rect(0, score, 10, 60);
     return output;
  }
  ...

有什么想法吗?

谢谢, 保罗