Adding custome blend behaviour on ListboxItem

See more:

WPF

ListBox

Blend

Hi,
I am creating a custom blend behavior to act on ListboxItem i.e.

public class DragtestBehaviour : Behavior<ListBoxItem>
{
    public DragtestBehaviour()
    { // Insert code required on object creation below this point.
    }
    protected override void OnAttached()
    {
        base.OnAttached();
        // Insert code that you would want run when the Behavior is attached to an object.
    }
    protected override void OnDetaching()
    {
        base.OnDetaching();
        // Insert code that you would want run when the Behavior is removed from an object.
    }
}

What I am not able to figure out is how do I attach it to listboxitem.
Alternatively do I have to style the Listbox item and attach it to Border or any other element in style. If this is true than I have to also derive my behavior class from Border (i.e. Framework element).

DragtestBehaviour : Behavior<Frameworkelement>