multicombo fill options

Hello,
Is it possible to fill the multicombo inside a form dynamic with options data?
It looks like I have no access to the control from an event.

                    { view:"multicombo", id:"tagscontrl", label:"Tags", name: "tags", placeholder:"Tags",
                        newValues: true
                    }

        function onCogs(id){
            $$("editform").load("itemcogs.php?id="+id); //works
            //$$("tagscontrl").getList().clearAll(); //Works not
            //var list = $$("tagscontrl").getPopup().getList(); //Works not
            $$("cogswin").show(); //Works
        }

you need to add options as empty array to have getList possible.

{ view:"multicombo", id:"tagscontrl", label:"Tags", name: "tags", placeholder:"Tags",
                    newValues: true, options: []
                }