Hi,

Here is a code where you can track what is the position of X and Y co-ordinates-

1) I have applied the behavior by code. The class MouseDragElementBehavior contains few events. One of them is DragFinished. You can get the co-ordinates within that event as well. Look at the code below-

USER Control-

<UserControl

xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"

xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"

xmlns:i="clr-namespace:System.Windows.Interactivity;assembly=System.Windows.Interactivity"

xmlns:il="clr-namespace:Microsoft.Expression.Interactivity.Layout;assembly=Microsoft.Expression.Interactions"

x:Class="SampleProject.MainPage"

Width="640" Height="480">

<Grid x:Name="LayoutRoot" Background="White">

<TextBlock x:Name="txtcordinates" FontSize="20" Foreground="Blue"/>

<Rectangle Fill="Red" Stroke="Black" Margin="144,88,160,192" x:Name="rect1"/>

</UserControl>

UserControl Code in CS file-

Import a namespace in .CS file codebehind of MainPage.XAML

public partial class MainPage : UserControl
	{
		public MainPage()
		{
			// Required to initialize variables
			InitializeComponent();
            this.Loaded += new RoutedEventHandler(MainPage_Loaded);
		}

        void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            MouseDragElementBehavior behavior = new MouseDragElementBehavior();
            behavior.Attach(rect1);
            behavior.DragFinished += new MouseEventHandler(behavior_DragFinished);
         
        }

        void behavior_DragFinished(object sender, MouseEventArgs e)
        {
            Point getposition = e.GetPosition(rect1);
            txtcordinates.Text="Position X : " + getposition.X + "                " + "Position Y" + getposition.Y;
        }

       
}

Let me know If this works for you!!

Thanks,

Pravin

"Please Mark as answered, If this answers your question"