Flash form: send ComboBox label to PHP script

I know there’s been tons of questions threads about this, but I still can’t figure out how to send the selected the item selected in the combobox component as a variable to my PHP script. Please help…

My combobox instance is named cSubject


stop();

var form_lv:LoadVars = new LoadVars();
var dummy_lv:LoadVars = new LoadVars();
 
mcButton.onRelease = function():Void {
 form_lv.name = _root.cName.text;
 form_lv.initials = _root.cInitials.text;
 form_lv.email = _root.cEmail.text;
 form_lv.subject = _root.cSubject.selectedItem;
 form_lv.message = _root.cessage.text;
 form_lv.sendAndLoad("t_email.php", dummy_lv, "POST");
 nextFrame();
}

Can anyone tell me what I am doing wrong? I thought it should work like this. Thanks in advance!