Removing dynmically created Radio Button Group

I am new to ActionScript 3. I found the code to create a set of radio buttons - the problem is that each time I call a subroutine, it seems to create a new set on top of them (hence they get darker each time someone clicks them. I need to be able to clear them from the stage and start over - basically the code creates a set of radio buttons, and then a set of radio buttons for each of the main buttons created. I've tried destroy object - generates compiler errors.