AS3阵列问题

[Bindable] private var arr_activities:Array; 
var test: _Aktivitaet;
arr_activities = event.result as Array;
test = arr_activities.pop() as _Aktivitaet;

_Aktivitaet是一个自定义类:

package at.moschitz.topfive
{
  [RemoteClass(alias="Aktivitaet")]
  [Bindable]
  public dynamic class _Aktivitaet extends MyEntity
  {
    public var AktID:int;
    public var AktName:String;
    public var AktMindAlter:int;
    public var AktMaxAlter:int;
    public var AktKategorie:_AktKategorie;
    public var AktIsActive:Number;
  }
}

马丁