Flash php email - using a ComboBox

Hi All

Had a search and can’t find a solution…

used this tutorial http://www.kirupa.com/developer/actionscript/flash_php_email.htm to create a form within my flash movie and I’ve added extra fields with no problem, but how do i add a ComboBox?
The text fields have a variable assigned to them - but you can’t do this with a ComboBox, so what’s the solution?
I’m no flash/php expert so sorry if this seems obvious!