WPF AdvancedListBox for Zune effect

I like WPF very much and I often prepare some controls for my applications. This time I want to show a simple control extension added to ListBox. Its name is AdvancedListBox that uses custom ListBoxItem and it exposes some properties to know if ListBox is loosing or capturing the selection.

Using style I have created a sample that simulates Zune navigation effect: a background animation from previous to next selection. Here the result: