Stop button selectability by tabbing

I hate have posted two threads in 2 days, but I need to know how to prevent this:
In flash, if you have a textField selected, then you hit tab, it will select a button near/below it. How can I stop this?

When the textField has focus, and you hit the tab button, it adds in a tab to the textField, which is what I want, but it also then puts a yellow border around a button/movieClip near it. I just want to know how to stop that from happening.