zk.afterLoad('zkmax.wgt', function() {
    var _origDropuploadImpl = {};
    zk.override(zkmax.wgt.Dropupload.prototype, _origDropuploadImpl, {
        _dropAction : function(event) {
    		event.stop();
            if (event.originalEvent.dataTransfer.files.length > maxFileAllowed) {
                jq.alert(msgzk.MESSAGE_FILE_OVER_LIMITATION, {icon:'ERROR'});
                this.setVisible(false);
                return;
            }
            _origDropuploadImpl._dropAction.apply(this, arguments)
        }
    });
});