Can anyone explain the difference between these 2 versions?

I don't understand why Version 2 works and Version 1 does not. Both are on the main timeline, however Version 2 nests one clip inside the other. They both display correctly, however mouse-dragging only works on the Version 2. The events don't get fired for Version 1. Can anyone explain what's up?


Version 1:

this.createEmptyMovieClip("thisClip",getNextHighestDepth());
thisClip.loadMovie("man.swf");
thisClip.onPress = image_press;
thisClip.onRelease = image_release;


Version 2:

this.createEmptyMovieClip("thisClip",getNextHighestDepth());
thisClip.createEmptyMovieClip("man", thisClip.getNextHighestDepth());
thisClip .man.loadMovie("man.swf");
thisClip.onPress = image_press;
thisClip.onRelease = image_release;


The handlers are defined as simple calls to startDrag/stopDrag:

function image_press() {
this.startDrag(false);
trace("man press");
}

function image_release() {
this.stopDrag();
trace("man release");
}