“but this will open in the same movieclip, it doesn't
pop up unless i missed something.”
I gave you info on attachMovie() because the lack of info you
provided. I assumed you didn’t know the technical name of the
effect you wanted.
For a VERY simple start do the following;
-Put the code from the bottom of this post in frame 1.
-drag a Window component into your library.
-create a MovieClip on stage with an instance name of
“showWindow_btn”
-compile!