Unable to attach onMouseOver event to clip??

[AtomicChip]

Here's my code (AS2.0 within a class):

class MouseOverButton extends UIComponent
{
//...
private function createChildren()
{
    this.createEmptyMovieClip("mc_off",0);
    this.createEmptyMovieClip("mc_on",1);

    this.mc_off.onMouseMove = function()
    {
        trace("foo");
    };

    this.mc_on.onMouseMove = function()
    {
        trace("foo");
    };

    invalidate();
}
//...
}

Any ideas why neither of the onMouseMove events are triggered? If I substitute this.mc_on.onMouseMove for this.onMouseMove, it works fine - but I don't want the onMouseMove for the parent clip, I want it for the child clip...

Any ideas?

Thanks

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