[flexcoders] Help on the syntax for function set blah(param:String)

[tjcox1969]

I have read the section on functions in the Adobe Programming
Actionscript manual, but I see no reference to this type of syntax:

[Bindable]
public function set statesNames(value:ListCollectionView):void {
        _statesNames = value;
}
        
public function get statesNames():ListCollectionView {
        return _statesNames;
}

Can someone point me to some documentation on this or give a brief
explanation.  I am looking at a sample I found and it works, but I
want to know why and when to use this type of "function set blah()"
syntax over "function setBlah()"

Thanks!