Add eventlistener from external swf

Hi all!

Im loading in an external swf into my main swf and this external swf has two buttons, one send button and one abort button. Boths buttons ends up width unloading the external swf and here comes my question. I need theese buttons to add an eventlistener to a movieclip in the main swf.

what i want to do is to remove the eventlistener on the button that loads the external swf so that it only can be loaded once and when you press either abort or send in the external swf i want to readd the loading eventlistener to the button in the main swf. how can i do that?