A Flash component idea: create a component that when activated with a key combo, will display the document stacks (that is, which movieclip is sitting on top of which one, etc.) The user can get more info (such as position, depth #, mc name, etc.) when mouse over the stack layer.

This will be helpful for debugging to figure out where things are, and if they are appearing in the right order.

A more advanced of this component could even hook into selected events and visually display it (such as flashing the text) when the function is called.