you can use attachMovie() to create a movieclip instance from a library instance. just assign your library movieclip a linkage id and use that in the first parameter of attachMovie().
My knowledge with AS is essentially non-existant. I added the following code on an actions layer in the movie clip (mc_menu):
I do not have any code in the main timeline for this interaction.
I tried to place the mc_forecaster2_test on the main timeline stage, and put in code to make the visible false, and code in mc_menu to make the visible true, but so far, nothing has worked.