When you start dragging and your window isn't the main one, the dragAdorner isn't shown.

Please change CreateDragAdorner into: static void CreateDragAdorner() { DataTemplate template = GetDragAdornerTemplate(m_DragInfo.VisualSource);

        if (template != null)
        {
            UIElement rootElement = null;
            // Find the current top window 
            Window parentWindow =

TryFindParent<Window>(m_DragInfo.VisualSource); if (parentWindow != null) rootElement = parentWindow.Content as UIElement; if (rootElement == null) rootElement = (UIElement)Application.Current.MainWindow.Content; UIElement adornment = null; ....

The TryFindParent method is well documented at http://www.hardcodet.net/2008/02/find-wpf-parent

Good luck,

Frank

Thanks for the report and the fix! Patch committed. I didn need TryFindParent - I have my own extension method GetVisualAncestor<> which does the same thing.

Could you check the patch indeed fixes the problem for you?

Comment deleted

Applied to trunk in r20.

Ok, I will see it.

When you drag a root to a child you now get grandchildren. I'm yet altering your component to preserve the level in a TreeList (using the classes of the interfaces).

That might be something for the generic Component. A boolean called PreserveLevel that only allows starting a drag when all items have the same level and allow dropping when the target has that same level (or one higher).

Issue 23 has been merged into this issue.