This is what layers are for. Create a topmost layer in Animate and put all your buttons there.
Your notion about divs is not possible in Animate because it Does Not Work That Way. Animate symbols are not browser DOM objects. Every symbol is painted to a single HTML canvas element.
ClayUUID is correct, however, you actually can create separate DIVS within animate, if you want, its not recommended as you need to manually code positions, layer order etc etc and worry about overlapping elements.