Referring to a button that is not in the same scene

Hello everyone.

Im new to actionscript and I have been all day trying to find my way through a particular issue. Now I need someones help because I am going round in circles without achieving anything.

This is my scenario

Layer : actions (attaches a scrollbar and a mask to the textfield at the bottom)

layer : movieclip - layer : Buttons. (Some animations here with buttons)

layer : mask (mask for the textfield)

layer : movieclip - layer: text field
--------------------- layer:actions (here I want to refer to them buttons in order to make links into some external text files but I can’t simply with an instance name)

Help would be really appreciated.

Thank you all!