How to animate ListBoxItem position - silverlight

Question

I am having some trouble animating the items in my ListBox. Animations on the OpacityProperty work great but when i try to animate the position of my ListBoxItem it simply does not move an inch (No exceptions are thrown, not even a log message indicating error).
Here is the code i am using:
private void deletAnimation()
{
Todo todoToDelete = App.ViewModel.Todos[1];
Storyboard storyboard = new Storyboard();
DoubleAnimation alphaAnim = new DoubleAnimation();
alphaAnim.From = 1;
alphaAnim.To = 0;
alphaAnim.Duration = new Duration(TimeSpan.FromMilliseconds(500));
ListBoxItem target = TodoList.ItemContainerGenerator.ContainerFromItem(todoToDelete) as ListBoxItem;
Storyboard.SetTarget(alphaAnim, target);
Storyboard.SetTargetProperty(alphaAnim, new PropertyPath(UIElement.OpacityProperty));
storyboard.Children.Add(alphaAnim);
for (int i = App.ViewModel.Todos.IndexOf(todoToDelete) + 1; i < App.ViewModel.Todos.Count; i++)
{
Todo todo = App.ViewModel.Todos[i];
target = TodoList.ItemContainerGenerator.ContainerFromItem(todo) as ListBoxItem;
DoubleAnimation translateAnim = new DoubleAnimation();
translateAnim.From = target.RenderTransformOrigin.Y;
translateAnim.To = target.RenderTransformOrigin.Y - target.ActualHeight;
translateAnim.Duration = new Duration(TimeSpan.FromMilliseconds(500));
translateAnim.BeginTime = TimeSpan.FromMilliseconds(500);
Storyboard.SetTarget(translateAnim, target);
Storyboard.SetTargetProperty(translateAnim, new PropertyPath(TranslateTransform.YProperty));
storyboard.Children.Add(translateAnim);
}
storyboard.Begin();
}
Some things i have noticed while debugging:
The RenderTransformOrigin.Y property is always 0 no matter which ListBoxItem is referenced.
The Height property is NaN though the ActualHeight property is 67
The parent property of the ListBoxItem is null
These two things make me wonder if i am given a reference to a ListBoxItem that is not rendered of the screen? But as the Opacity animation works perfectly and all of my list is visible(only contains 3 items at the moment) i do not see how this could be the case.
I have also tried using a PointAnimation and animating the RenderTransformOrigin property directly but this gave the same result (nothing that is).
Any help is appreciated, thanks!

Answer 1

Please check out this link:
http://blogs.msdn.com/b/jasongin/archive/2011/01/03/wp7-reorderlistbox-improvements-rearrange-animations-and-more.aspx
Someone has created a class that you can easily incorporate into your app. This has animations for adding/removing items from your list.
This should save you a lot of time and frustration.