Hi Priyank,

The scatter series has a ToolTip property which you can set to some FrameworkElement that you want to use to represent your tooltip.  Since you are creating the series in code behind, an easy way to handle this is to create a DataTemplate in your XAML that defines what your tooltip will look like.  Then in code behind you can call DataTemplate.LoadContent() in order to instantiate this tooltip content.  Ex:

XAML:

<DataTemplate x:Key="ToolTipTemplate">
    <Grid>
        <TextBlock Text="{Binding Item.ValueProperty}"/>
    </Grid>
</DataTemplate>

Code behind:

var series = new ScatterSeries();
series.ItemsSource = mydata;
series.XMemberPath = "X";
series.YMemberPath = "Y";
series.XAxis = xAxis;
series.YAxis = yAxis;

var dt = Resources["ToolTipTemplate"] as DataTemplate;
series.ToolTip = dt.LoadContent();