public MainPage()
{
    // Required to initialize variables
    InitializeComponent();

    ISEventManager.RegisterInstanceHandler(
        this.LayoutRoot, // any element in the routed path which applicable in your scenario
        DragDrop.DropEvent, // the routed event
        new Intersoft.Client.UI.Controls.Interactivity.DragEventHandler(DropTarget_Drop), // the event handler
        true);
}

private void DropTarget_Drop(object sender, Intersoft.Client.UI.Controls.Interactivity.DragEventArgs e)
{
    // get the source object.
    UIElement sourceElement = e.GetSourceElement();
    StackPanel panel = sourceElement as StackPanel;
    Image image = VisualTreeHelper.GetChild(panel, 0) as Image;
    TextBlock text = VisualTreeHelper.GetChild(panel, 1) as TextBlock;

    // create the copy object.
    StackPanel copyPanel = new StackPanel() { HorizontalAlignment = HorizontalAlignment.Center, VerticalAlignment = VerticalAlignment.Center };
    Image copyImage = new Image() { Source = image.Source, Height = 64, Width = 64 };
    TextBlock copyText = new TextBlock() { Text = text.Text };
    copyPanel.Children.Add(copyImage);
    copyPanel.Children.Add(copyText);
    copyPanel.Opacity = 0; // to make the return animation smooth.

    // register the copy object.
    List<UIElement> elements = new List<UIElement>();
    elements.Add(copyPanel);
    e.SetDropElements(elements); // this method basically set the object that going to be added to the drop target
                                 // since this is copy scenario, we add the copied object, but theoritically you can use any object even multiple objects
}