Problem with rollover in movieclip in scrollpane

This is a followup question from this thread:
https://www.experts-exchange.com/questions/22044839/Scrollpane-with-movieclips.html

Now I have this script that works excellent with the help from the great Aneeshchopra.

my_mc is a empty movieclip in my library
and clip1 and clip2 are the clips i need to display in my scrollpane.

mypane.contentPath = "my_mc";
mycontainer = mypane.content;
temp = mycontainer.attachMovie("clip1", "clip1", 1, {_y:0});
temp2 = mycontainer.attachMovie("clip2", "clip2", 2, {_y:18});

after this script here above which works excellent like i mentioned I have this script because I want to interact with clip1 and clip2:

clip1Class.prototype = new MovieClip();
Object.registerClass("clip1", clip1Class);
clip1Class.prototype.onRollOver = function() {
      trace("rollover");
};

But I cant get it to do the trace?

Does anybody know whats the problem here?