Как я могу реализовать legendstyle с флажком для modernuichart

Hello all,
I need your help please!
i already search few days about ModerUIcharts with de.thorsten.mandelkow.dll problem is, i would like to add checkboxen in front of the legend item, to show or now show the series item.... but iam I am desperate

this is my chart with binding to a little class only with name and count for the series...

 <Grid>

                <!--<Grid.Resources>
          todo:  here style template for legenditem checkbox
and bind in MetroChart:ChartSeries 
        </Grid.Resources>-->

        <MetroChart:ClusteredBarChart   ChartTitle="{Binding Path=chatit}" ChartSubTitle="{Binding Path=chatitsub}" HorizontalAlignment="Left" Margin="10,10,0,0" VerticalAlignment="Top" Width="744" Height="427" >
            <MetroChart:ClusteredBarChart.Series>

                <MetroChart:ChartSeries 
                             
                DisplayMember="Name"
                                    ItemsSource="{Binding Path=Data}"
                SeriesTitle="Modelle"
                ValueMember="Count" 
                    HorizontalAlignment="Center" />
     
            </MetroChart:ClusteredBarChart.Series>

        </MetroChart:ClusteredBarChart>


    </Grid>