Ignoring actionscript problem with senocular collapsing menu

I’m trying to modify this wonderfully simple (for the simple minded like me) menu to allow some animation within the buttons. After many tries I’ve come up with this method manipulating a movie clip on top of the button (see attached). I arrived here because having the button as a movieclip with actionscripting has not worked, as the script for making the window do it’s thing seems to cancel it out, or vice versa.

As convoluted as it seems, it mostly works, except when you click on a closed button underneath an open button. If you click on a closed button on top of an open button, it works flawlessly. Just start with the bottom button first and you’ll see what I mean.

The files are attached. Any help is greatly appreciated. Thanks.