Nested Events

I am attempting to make a movie clip with a complex rollover a la this tutorial:

that has another movie clip with its own complex rollover nested within in. I’m finding that the nested movie clip cannot seem to process events such as this.onEnterFrame and this.onRollOver. I suspect it has to do with the parent movie also having and/or processing events. Any advice or ideas that might shed light on this for me would be so greatly appreciated! Thanks!