Tab.index

Hi, new comer to the site. Want to thank all who have contributed tutorials. all very helpful. Here is my question.
I recently used the form tutorial in my flash site. I have a MC named form
which is called into my main movie. When a user attempts to access the form using the tab function to jump form each input box - it appears that the tab jumps in and out of the MC. It seems to go from the MC to the maintime line and back. I tried giving each input instance box a name and then indexed as such.
name.tabIndex = 1; and so on.
I placed this actions script everywhere in my movie with no success.
Hope you can help me
T
http://www.kacdesigns.com