use of COM object

Hello, I have to use a COM object with following properties: ... Property StationsX(lIndex As Long) As Long Property StationsY(lIndex As Long) As Long ... I didn't manage to initialize these properties. I create a new COM object with: $obj = new COM("********"); If I try $obj->StationX(0)=$val; I get an error message ( StationX(0) is then known as a function. So, I can't put a value in it) So, I want to use com_propput but it doesn't work. Can any one help me, giving me the good syntax for com_propput, or giving me advices... I'm using PHP 4.2.2 Thank u very much