Silverlight Toolkit - Read Selected Value Of A Data Point On Bubble Chart

I have created a Bubble chart using silverlight tookit as follows :

<charting:Chart Title="Bubble Chart"
LegendTitle="Legend"
Name="chart1" Margin="0,0,0,42"
HorizontalAlignment="Left" Width="568">
<charting:Chart.Series>
<charting:BubbleSeries Title="Pollutant A" IsSelectionEnabled="True"
ItemsSource="{Binding Pollution}"
IndependentValuePath="AQI"
DependentValuePath="Level"
SelectionChanged="ChangeSomething"
SizeValuePath="size1" >
</charting:BubbleSeries>
</charting:Chart>

And my xaml.cs defines the handler like this :

private void ChangeSomething(object sender, SelectionChangedEventArgs e){
Text1.text="selection changed"
// Here I want to show the value of the bubble selected
}