<Path Stretch="Uniform"  Width="750" Height="750" StrokeThickness="40" Stroke="Blue" Fill="Transparent">
            <Path.Data>
                <GeometryGroup>
                    <EllipseGeometry Center="1,1" RadiusX="1" RadiusY="1"/>
                    <LineGeometry StartPoint="1,1" EndPoint="1,0"/>
                    <LineGeometry StartPoint="1,1" EndPoint="1.866,1.5"/>
                    <LineGeometry StartPoint="1,1" EndPoint="0.134,1.5"/>
                </GeometryGroup>
            </Path.Data>
        </Path>

<Window x:Class="Astro.MainWindow"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:local="clr-namespace:Astro"
        Title="MainWindow" Height="350" Width="525" WindowState="Maximized">
    <StackPanel>
        <local:RotateControl x:Name="rtc1" Angle="{Binding ElementName=rtc2, Path=Angle}" Height="350" Width="350"/>
    </StackPanel>
</Window>

   <Style TargetType="{x:Type local:RotateControl}">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="{x:Type local:RotateControl}">
                    <Border Background="{TemplateBinding Background}"
                            BorderBrush="{TemplateBinding BorderBrush}"
                            BorderThickness="{TemplateBinding BorderThickness}">
                        <Grid>
                            <!-- Image for the dial -->
                            <Image RenderTransformOrigin=".5 .5">
                                <Image.RenderTransform>
                                    <RotateTransform Angle="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Angle}"></RotateTransform>
                                </Image.RenderTransform>
                                <Image.Source>
                                    <DrawingImage>
                                        <DrawingImage.Drawing>
                                            <GeometryDrawing Brush="{StaticResource RedWhiteBrush}" Pen="{StaticResource BlackPen1}" >
                                                <GeometryDrawing.Geometry>
                                                    <EllipseGeometry RadiusX="50" RadiusY="50"></EllipseGeometry>
                                                </GeometryDrawing.Geometry>
                                            </GeometryDrawing>
                                        </DrawingImage.Drawing>
                                    </DrawingImage>
                                </Image.Source>
                            </Image>
                        </Grid>
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>