MARKUS

    <Style TargetType="{x:Type Line:ArrowArcControl}">

        <Setter Property="Template">

            <Setter.Value>

                <ControlTemplate TargetType="{x:Type Line:ArrowArcControl}">

                    <Path x:Name="PART_ArcPath" 

                          Stroke="{TemplateBinding StrokeColor}"  

                          StrokeThickness="{TemplateBinding LineSize}"

                          Data="{TemplateBinding PathData}" 

                          RenderTransformOrigin="0.5,0.5" 

                          Fill="{TemplateBinding StrokeColor}">

                    </Path>

                </ControlTemplate>

            </Setter.Value>

        </Setter>

    </Style>