Flash MovieClip menus

I am currently working on my first flash project, and I was wondering about how I should implement dynamic menus over movieclip instances.

Very specifically, I have an array of movieclips which I have created a mouse over event. On the mouse over I would like to create a menu of options. When i create this menu of items after I mouse over, do I need to create and destroy the onclick event everytime i mouse over/ then demouse over? This seems very process intensive. Not only that I didnt see a leave mouse over event.

I guess the another option would be is to create a static menu that I could dynamically change the labels, and position depending on what i moused over.

Thanks in advance for your help.

I have been reading about destroying objects and that the garbage collection in Action Script 3.0 is not that intuitive. SO i was just wondering what design guys would recommend to do this.