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        <Button Name="btnTriangle" Height="60" Width="110" Content="Knopf">
            <Button.Template>
                <ControlTemplate TargetType="{x:Type Button}">
                    <Grid Margin="5">
                        <Path Stroke="Black" StrokeThickness="1">
                            <Path.Data>
                                <GeometryGroup>
                                    <LineGeometry StartPoint="0,0" EndPoint="100,0" />
                                    <LineGeometry StartPoint="100,0" EndPoint="50,50" />
                                    <LineGeometry StartPoint="50,50" EndPoint="0,0" />
                                </GeometryGroup>
                            </Path.Data>
                        </Path>
                        <ContentPresenter Name="content" HorizontalAlignment="Center" VerticalAlignment="Top" Margin="10" />
                    </Grid>
                </ControlTemplate>
            </Button.Template>
        </Button>