Controlling external SWF

In my flash file I am loading external SWF’s via a MovieClipLoader object but I am having trouble controlling it. Specifically I would like to be able to have the external SWF stop at the end rather than looping back to the beginning- so that I can give the user the option as to whether he would like to replay the movie or watch a different movie. Is there any way to go about this? Thanks for the help!