onPress function doesnt work for createEmptyMovieClip

programming flash
1

I’ve created a new movieClip on the stage using the following, which works fine:

_root.object1_mc = _root.createEmptyMovieClip(“object1_mc” , _root.getNextHighestDepth());
_root.object1_mc.loadMovie(“object1.png”);

I’ve also added the following which doesnt work:

_root.object1_mc.onPress = function ()
{
trace(“pressed”);
};

Is it possible to add a onPress function to a dynamically loaded clip?

Thanks