DisplayObjects, Loaders and Bugs

Im building a multi gallery site. A major buggy area Ive found is while an element is loading and then another part is asked to load, usually included removing and adding children…Is there a good way of telling different parts, usually Sprites, that things are loading so maybe make them deactive…do i have to go as far a set up custom event classes? if i do, anyone have any nice examples?
thanks
dai