void List_MouseMove(object sender, MouseEventArgs e)
        {
            Point current = e.GetPosition(this);

            if (sender is ListBoxItem && e.LeftButton == MouseButtonState.Pressed)
            {
                ListBoxItem draggedItem = sender as ListBoxItem;
                draggedItem.IsSelected = true;
                adorner = new DragAdornerToolboxItem(draggedItem, GetMousePosition());
                AdornerLayer.GetAdornerLayer(this).Add(adorner);
                DragDrop.DoDragDrop(draggedItem, draggedItem, DragDropEffects.Copy);
                AdornerLayer.GetAdornerLayer(this).Remove(adorner);
            }
            startPoint = current;
        }
        void List_MouseMove(object sender, MouseEventArgs e)
        {
            Point current = e.GetPosition(this);
            if (sender is ListBoxItem && e.LeftButton == MouseButtonState.Pressed)
            {

                ListBoxItem draggedItem = sender as ListBoxItem;
                draggedItem.IsSelected = true;
                adorner = new DragAdornerToolboxItem(draggedItem, GetMousePosition());
                AdornerLayer.GetAdornerLayer(this).Add(adorner);
                DragDrop.DoDragDrop(draggedItem, draggedItem, DragDropEffects.Copy);
                AdornerLayer.GetAdornerLayer(this).Remove(adorner);
            }
            startPoint = current;
        }