Custom legend in wpf chart

Firstly, I am very new to wpf and XAML. The majority of my background is with Windows forms apps.

I have a very simple chart with three Line Series bound to data objects. I would like to customize the legend to show not only the Line Series colors and titles, but also add a textblock under each legend item to display the last data point value in the series.

Here is what I have so far:

<Grid Grid.Row="1" Grid.Column="1" Background="{StaticResource graphBackground}" >
            <Grid.Resources >
                <Style TargetType="charting:LineSeries" >
                    <Setter Property="PolylineStyle" >
                        <Setter.Value>
                            <Style TargetType="Polyline" >
                                <Setter Property="StrokeThickness" Value="5" />
                            </Style>
                        </Setter.Value>
                    </Setter>
                </Style>
                <Style x:Key="LegendItemStyle" TargetType="charting:LegendItem" >
                    <Setter Property="Template">
                        <Setter.Value>    
                            <ControlTemplate TargetType="{x:Type charting:LegendItem}">
                                <Border BorderBrush="Black" BorderThickness="0">
                                    <StackPanel>
                     开发者_运维知识库                   <StackPanel Orientation="Horizontal" >
                                            <Rectangle Width="12" Height="12" Fill="{Binding Background}" />
                                            <datavis:Title Content="{TemplateBinding Content}" FontSize="18" Margin="10"/>
                                        </StackPanel>
                                        <StackPanel Orientation="Horizontal" >
                                            <TextBlock Text="{Binding}" />
                                        </StackPanel>
                                    </StackPanel>
                                </Border>
                            </ControlTemplate>
                        </Setter.Value>
                    </Setter>
                </Style>
            </Grid.Resources>
            <charting:Chart FontWeight="Bold">
                <charting:Chart.Axes>
                    <charting:LinearAxis Orientation="Y" Minimum="0" Maximum="{Binding Path=graphmax}" Interval="{Binding Path=graphinterval}" ShowGridLines="True" FontSize="18" />                            
                    <charting:DateTimeAxis Orientation="X" FontSize="18" Minimum="{Binding Path=datemin}" Maximum="{Binding Path=datemax}" IntervalType="Months" Interval="1" />
                </charting:Chart.Axes>
                <charting:LineSeries ItemsSource="{Binding Path=dataPoints}" DependentValuePath="Value" IndependentValuePath="Key" Title="13 Wk" LegendItemStyle="{DynamicResource LegendItemStyle}">
                    <charting:LineSeries.DataPointStyle>
                        <Style TargetType="charting:LineDataPoint" >
                            <Setter Property="Background" Value="Green" />
                            <Setter Property="Opacity" Value="0" />
                        </Style>                                   
                    </charting:LineSeries.DataPointStyle>                        
                </charting:LineSeries>

I think the issue is that you are using {Binding}, which would bind to your DataContext object, which I believe is in this case is the LegendItem itself. Here's a good explanation of what {Binding} does. You would either want to add a path to get a specific property, or use a converter to format the result the way you want.