Accessing lower Layers of the Scene

Hey Folks,

this should be a rather simple one:
I have rigged up a character a friend of mine sent me as PSD file.
Now I have the problem, that the symbol contures are the size of her initial canvas. So that if I want to select the Leg it selects the glasses, because they are the utmost layer. Is there a way of telling animate to disregard the transparent parts of a layer while selecting? Or can you resize the window each symbol is in? So that the glasses are only selected when actually clicking on them.

Cheers and thanks in advance