Retrieves a cookie identifying the rendering behavior on which this event was fired.
HRESULT value = object.get_behaviorCookie(long* p);
the behavior cookie.
The IHTMLEventObj3::behaviorCookie property is only applicable for rendering behaviors.
An element may have more than one attached rendering behavior. The IHTMLEventObj3::behaviorCookie property identifies the rendering behavior that was hit and corresponds to the identifier returned by the IHTMLElement2::addBehavior method.