code: function(classname) {
      this.base(arguments);
      this.initType();
      var args = qx.lang.Array.fromArguments(arguments);
      var t = this;
      this.__classes = [];
      args.forEach(function(arg) {
        if (qx.lang.Type.isArray(arg)) {
          qx.lang.Array.append(t.__classes, arg);
        } else {
          t.__classes.push(arg); 
        }
      });
      this.set({ include: [], exclude: [] });
    }
docs: Constructor
  @param classname[, classname...] {String|String[]}