My version of sombody else's code: Finding the Index of an item in a Drag Drop operation

While working on an application that requires drag and drop, I ran into trouble when trying to figure out where in the target list (in my case, a ListBox) to insert the dropped item. I ran across Josh Smith's article Drag and Drop Items in a WPF ListView which covers (quite nicely) how to handle drag and drop operations within and between ListViews. While reading through the code, I found that he uses some code from Dan Crevier which was posted on Lester's Blog. Ok, now that I have taken you through the tangled web of other people's code, I will share how I used the code and changed it a little to work in my situation.

public static Point GetMousePosition(Visual relativeTo)
{
    Win32Point mouse = new Win32Point();
    GetCursorPos(ref mouse);

    System.Windows.Interop.HwndSource presentationSource =
        (System.Windows.Interop.HwndSource)PresentationSource.FromVisual(relativeTo);

    ScreenToClient(presentationSource.Handle, ref mouse);

    GeneralTransform transform = relativeTo.TransformToAncestor(presentationSource.RootVisual);

    Point offset = transform.Transform(new Point(0, 0));

    return new Point(mouse.X - offset.X, mouse.Y - offset.Y);
}

public static int GetIndexUnderDragCursor(ItemsControl control)
{
    int index = -1;
    for (int i = 0; i < control.Items.Count; ++i)
    {
        if (control.ItemContainerGenerator.Status == GeneratorStatus.ContainersGenerated)
        {
            DependencyObject item = control.ItemContainerGenerator.ContainerFromIndex(i);
            if (IsMouseOver(item as Visual))
            {
                index = i;
                break;
            }
        }
    }
    return index;
}

public static bool IsMouseOver(Visual target)
{
    if (target == null)
        return false;
    Rect bounds = VisualTreeHelper.GetDescendantBounds(target);
    Point mousePos = GetMousePosition(target);
    return bounds.Contains(mousePos);
}

I didn't change the GetMousePosition method at all from what I found on Lester's blog. Then I slightly modified some of Josh's code so that it is a little more general. I hope this helps. Suggestions welcome.