Silverlight: создание шаблона круглой кнопки

Это близко, но сделать его идеально круглым краем сложнее. Я сделал это круглой формой, а не прямоугольником с закругленными кривыми. Посмотрите, поможет ли это:

    <Style x:Key = "roundButton"
       TargetType = "Button">
  <Setter Property = "Template">
    <Setter.Value>
      <ControlTemplate TargetType = "Button">
        <Grid>
          <Grid.RowDefinitions>
            <RowDefinition Height = "0.479*" />
            <RowDefinition Height = "0.521*" />
          </Grid.RowDefinitions>
          <Grid.ColumnDefinitions>
            <ColumnDefinition Width = "0.147*" />
            <ColumnDefinition Width = "0.685*" />
            <ColumnDefinition Width = "0.168*" />
          </Grid.ColumnDefinitions>
          <vsm:VisualStateManager.VisualStateGroups>
            <vsm:VisualStateGroup x:Name = "FocusStates">
              <vsm:VisualState x:Name = "Unfocused" />
              <vsm:VisualState x:Name = "Focused" />
            </vsm:VisualStateGroup>
            <vsm:VisualStateGroup x:Name = "CommonStates">
              <vsm:VisualState x:Name = "MouseOver" />
              <vsm:VisualState x:Name = "Normal" />
              <vsm:VisualState x:Name = "Pressed" />
              <vsm:VisualState x:Name = "Disabled" />
            </vsm:VisualStateGroup>
          </vsm:VisualStateManager.VisualStateGroups>
          <Path Margin = "-2,8,2,8"
                Grid.Column = "1"
                Grid.RowSpan = "2"
                Fill = "{TemplateBinding Background}"
                Stretch = "Fill"
                Stroke = "#FF000000"
                Data = "M25.999998,0.5 L26.499998,0.55732149 L26.499998,0.50000316 L184.5,0.50000316 L184.5,0.55732256 L185,0.5 C199.0833,0.50000429 210.5,13.483747 210.5,29.500002 C210.5,45.516144 199.0833,58.500004 185,58.500004 L184.5,58.44268 L184.5,58.500004 L26.499998,58.500004 L26.499998,58.44268 L25.999998,58.500004 C11.916747,58.500004 0.5,45.516209 0.5,29.500002 C0.5,13.483672 11.916748,0.50000429 25.999998,0.5 z"
                StrokeThickness = "0" />
          <ContentControl FontFamily = "{TemplateBinding FontFamily}"
                          FontSize = "{TemplateBinding FontSize}"
                          FontStyle = "{TemplateBinding FontStyle}"
                          FontWeight = "{TemplateBinding FontWeight}"
                          Foreground = "#FFFFFFFF"
                          HorizontalContentAlignment = "Center"
                          VerticalContentAlignment = "Center"
                          Grid.ColumnSpan = "3"
                          Grid.RowSpan = "2"
                          Content = "{TemplateBinding Content}" />
        </Grid>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
  <Setter Property = "Background"
          Value = "#FFFF0000" />
</Style>