Silverlight Charting LineSeries - Add caption to the datapoint

 <toolkit:Chart Title="Sales" Name="ChartSales">
                     <toolkit:Chart.Series>
                <toolkit:LineSeries
                            Title="Serie1" Name="LineSerie1"
                            IndependentValueBinding="{Binding Key}"
                            DependentValueBinding="{Binding Value}" />
                <toolkit:LineSeries
                            Title="Serie3" Name="LineSerie3"
开发者_运维百科                            IndependentValueBinding="{Binding Key}"
                            DependentValueBinding="{Binding Value}" />

I have created a chart with 10 lineseries, all working nicely. However there are so much data on this chart that I need the caption that show up when pointing over the datapoint to be more explicit than 1243. I need to see the date and the title of the LineSerie

How do I proceed?

I figured it out combining these 2 links:

Datapoint tooltip for silverlight chart toolkit

Silverlight Charting: Creating rich data point tooltips