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POWPF ListBox drag & drop interferes with ContextMenu?
 

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    <p>I'm implementing drag &amp; drop from a ListBox, but I'm seeing some strange behaviour with a ContextMenu elsewhere in the window. If you open the context menu and then start a drag from the ListBox, the context menu closes but won't open again until after you perform another drag.</p> <p>Does this make sense? Anybody got any ideas what might be going on?</p> <pre><code>&lt;ListBox Grid.Row="0" ItemsSource="{Binding SourceItems}" MultiSelectListboxDragDrop:ListBoxExtension.SelectedItemsSource="{Binding SelectedItems}" SelectionMode="Multiple" PreviewMouseLeftButtonDown="HandleLeftButtonDown" PreviewMouseLeftButtonUp="HandleLeftButtonUp" PreviewMouseMove="HandleMouseMove"/&gt; &lt;ListBox Grid.Row="1" ItemsSource="{Binding DestinationItems}" AllowDrop="True" Drop="DropOnToDestination" /&gt; &lt;Button Grid.Row="2"&gt; &lt;Button.ContextMenu&gt; &lt;ContextMenu x:Name="theContextMenu"&gt; &lt;MenuItem Header="context 1"/&gt; &lt;MenuItem Header="context 2"/&gt; &lt;MenuItem Header="context 3"/&gt; &lt;/ContextMenu&gt; &lt;/Button.ContextMenu&gt; Button with context menu &lt;/Button&gt; </code></pre> <p>...</p> <pre><code>public partial class Window1 { private bool clickedOnSourceItem; public Window1() { InitializeComponent(); DataContext = new WindowViewModel(); } private void DropOnToDestination(object sender, DragEventArgs e) { var viewModel = (WindowViewModel)e.Data.GetData(typeof(WindowViewModel)); viewModel.CopySelectedItems(); } private void HandleLeftButtonDown(object sender, MouseButtonEventArgs e) { var sourceElement = (FrameworkElement)sender; var hitItem = sourceElement.InputHitTest(e.GetPosition(sourceElement)) as FrameworkElement; if(hitItem != null) { clickedOnSourceItem = true; } } private void HandleLeftButtonUp(object sender, MouseButtonEventArgs e) { clickedOnSourceItem = false; } private void HandleMouseMove(object sender, MouseEventArgs e) { if(clickedOnSourceItem) { var sourceItems = (FrameworkElement)sender; var viewModel = (WindowViewModel)DataContext; DragDrop.DoDragDrop(sourceItems, viewModel, DragDropEffects.Move); clickedOnSourceItem = false; } } } </code></pre>
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