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    copied!<p>After a bit of work I think I have it:</p> <pre><code>&lt;StackPanel Orientation="Horizontal"&gt; &lt;Controls:ListBoxDragDropTarget AllowDrop="True"&gt; &lt;ListBox x:Name="FromBox" Width="200" ItemsSource="{Binding IssueList}" DisplayMemberPath="Name"/&gt; &lt;/Controls:ListBoxDragDropTarget&gt; &lt;Controls:ListBoxDragDropTarget AllowDrop="True" Drop="ToBoxDragDropTarget_Drop"&gt; &lt;ListBox x:Name="ToBox" Width="150" ItemsSource="{Binding ObjectiveList}" DisplayMemberPath="Name" Margin="80,0,0,0" /&gt; &lt;/Controls:ListBoxDragDropTarget&gt; &lt;TextBlock x:Name="UpdateText"/&gt; &lt;/StackPanel&gt; </code></pre> <p>and the codebehind (which will now be refactored into my ViewModel):</p> <pre><code>public partial class MainPage : UserControl { public MainPage() { InitializeComponent(); IssueList = new ObservableCollection&lt;Issue&gt; { new Issue{ ID = 1, Name="One"}, new Issue{ ID = 2, Name="Two"}, new Issue{ ID = 3, Name="Three"}, new Issue{ ID = 4, Name="Four"}, new Issue{ ID = 5, Name="Five"}, }; ObjectiveList = new ObservableCollection&lt;Objective&gt; { new Objective {ID = 10, Name = "Ten"}, new Objective {ID = 11, Name = "Eleven"}, new Objective {ID = 12, Name = "Twelve"}, new Objective {ID = 13, Name = "Thirteen"}, new Objective {ID = 14, Name = "Fourteen"}, }; LayoutRoot.DataContext = this; } public ObservableCollection&lt;Issue&gt; IssueList { get; set; } public ObservableCollection&lt;Objective&gt; ObjectiveList { get; set; } private void ToBoxDragDropTarget_Drop(object sender, Microsoft.Windows.DragEventArgs e) { var droppedOnObjective = ((FrameworkElement)e.OriginalSource).DataContext as Objective; var args = e.Data.GetData(typeof(ItemDragEventArgs)) as ItemDragEventArgs; if (args != null) { var draggedItems = args.Data as SelectionCollection; var draggedItem = draggedItems[0]; if (droppedOnObjective != null) { var draggedIssue = (Issue)draggedItem.Item; if (!droppedOnObjective.Issues.Contains(draggedIssue)) { droppedOnObjective.Issues.Add(draggedIssue); UpdateText.Text = string.Format("Issue &lt;{0}&gt; added to Objective &lt;{1}&gt;", draggedIssue.Name, droppedOnObjective.Name); } else { UpdateText.Text = string.Format("Objective &lt;{0}&gt; already contains Issue &lt;{1}&gt;", droppedOnObjective.Name, draggedIssue.Name); } } else UpdateText.Text = "selections or dropOnObjective is null"; } else UpdateText.Text = "args null"; } } public class Issue { public int ID { get; set; } public string Name { get; set; } } public class Objective { public int ID { get; set; } public string Name { get; set; } public List&lt;Issue&gt; Issues { get; set; } public Objective() { Issues = new List&lt;Issue&gt;(); } } </code></pre>
 

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