Windows phone app

Question

Hello

I create a chart in my windows phone application with AmChart ,I want to put the selected value in the chart in a textBox How can i do this

Thnaks 

 This is my XAML CODE

 

        <amq:PieChart  x:Name="MyChart"  DataSource="{Binding Data}" ValueMemberPath="value" TitleMemberPath="axis"  Grid.ColumnSpan="3" Margin="0,175,10,0" />

And This My c# CODE 

 

public ObservableCollection<ItemData> _data = new ObservableCollection<ItemData>()

 {

 new ItemData() { axis = "Jan", value=5},

 

 new ItemData() { axis = "Apr", value=10}

 };

        public ObservableCollection<ItemData> Data { get { return _data; } }

        private void PhoneApplicationPage_Loaded(object sender, RoutedEventArgs e)

        {

            this.DataContext = this;

        }

        public class ItemData

        {

            public string axis { get; set; }

            public double value { get; set; }

        }