Is there any event for checkbox visibility changed in legenditem and we can subscribe to it.

Hii,
I have a solution
XAML code
<Grid Name="LayoutRoot">
<Grid.Resources>

    <Style x:Key="CategoryLegendItem" TargetType="DVC:LegendItem">
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="DVC:LegendItem">
                    <StackPanel Orientation="Horizontal">
                        <CheckBox VerticalAlignment="Center" IsChecked="{Binding RelativeSource={RelativeSource Mode=TemplatedParent}, Path=Owner.Visibility, Mode=TwoWay, Converter={StaticResource BooleanToVisibilityConverter1}}" Margin="0,0,3,0" />
                        <Rectangle Width="8" Height="8" Fill="{Binding Background}" Stroke="{Binding BorderBrush}" StrokeThickness="1" Margin="0,0,3,0" />
                        <DV:Title VerticalAlignment="Center" Content="{TemplateBinding Content}" />
                    </StackPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>
</Grid.Resources>
<DVC:Chart Name="mcChart"  >
</DVC:Chart>
C# 
ColumnSeries ser = new ColumnSeries { Title = kvpNuclide.Value, IndependentValueBinding = new Binding("Key"), DependentValueBinding = new Binding("Value") };
                ser.ItemsSource = null;
                ser.ItemsSource = listRelease;
                ser.DataPointStyle = columnStyleAqua;
                ser.LegendItemStyle = (Style)LayoutRoot.Resources["CategoryLegendItem"];
                mcChart.Series.Add(ser);