PrimeFaces.widget.TieredMenu.prototype.findNextItem = function(menuitem) {
	var nextitem = menuitem.nextAll('.ui-menuitem').first();

	if (!nextitem.length) {
		var nextSubmenu = menuitem.closest('ul.ui-menu-list').next(
				'.ui-menu-list');
		if (!nextSubmenu.length) {
			nextSubmenu = menuitem.closest('td').next('td').children(
					'.ui-menu-list:visible:first');
		}

		if (nextSubmenu.length) {
			nextitem = nextSubmenu.find('li.ui-menuitem:visible:first');
		}
	}
	return nextitem;
};

PrimeFaces.widget.TieredMenu.prototype.findPrevItem = function(menuitem) {
	var previtem = menuitem.prevAll('.ui-menuitem').first();

	if (!previtem.length) {
		var prevSubmenu = menuitem.closest('ul.ui-menu-list').prev(
				'.ui-menu-list');

		if (!prevSubmenu.length) {
			prevSubmenu = menuitem.closest('td').prev('td').children(
					'.ui-menu-list:visible:last');
		}

		if (prevSubmenu.length) {
			previtem = prevSubmenu.find('li.ui-menuitem:visible:last');
		}
	}
	return previtem;
};

PrimeFaces.widget.TieredMenu.prototype.getFirstMenuList = function(submenu) {
	return submenu.find('.ui-menu-list:not(.ui-state-disabled):first');
};

PrimeFaces.widget.TieredMenu.prototype.isRootLink = function(menuitem) {
	var submenu = menuitem.closest('ul');
	return submenu.parent().hasClass('ui-menu');
};

PrimeFaces.widget.TieredMenu.prototype.bindKeyEvents = function() {

	var $this = this;

	$this.cfg.vertical = true;

	this.keyboardTarget
			.on('focus.menubar', function(e) {
				$this.highlight($this.links.eq(0).parent());
			})
			.on('blur.menubar', function() {
				$this.reset();
			})
			.on(
					'keydown.menu',
					function(e) {

						var currentitem = $this.activeitem;

						if (!currentitem) {
							return;
						}

						var isRootLink = $this.isRootLink(currentitem), keyCode = $.ui.keyCode;

						switch (e.which) {
						case keyCode.LEFT:
							if (isRootLink && !$this.cfg.vertical) {
								var prevItem = currentitem
										.prevAll('.ui-menuitem:first');
								if (prevItem.length) {
									$this.deactivate(currentitem);
									$this.highlight(prevItem);
								}

								e.preventDefault();
							} else {
								if (currentitem.hasClass('ui-menu-parent')
										&& currentitem.children(
												'.ui-menu-child')
												.is(':visible')) {
									$this.deactivate(currentitem);
									$this.highlight(currentitem);
								} else {
									var parentItem = currentitem.closest(
											'ul.ui-menu-child').parent();
									if (parentItem.length) {
										$this.deactivate(currentitem);
										$this.deactivate(parentItem);
										$this.highlight(parentItem);
									}
								}
							}
							break;

						case keyCode.RIGHT:
							if (isRootLink && !$this.cfg.vertical) {
								var nextItem = currentitem
										.nextAll('.ui-menuitem:not(.ui-menubar-options):first');
								if (nextItem.length) {
									$this.deactivate(currentitem);
									$this.highlight(nextItem);
								}

								e.preventDefault();
							} else {
								if (currentitem.hasClass('ui-menu-parent')) {
									var submenu = currentitem
											.children('.ui-menu-child');

									if (submenu.is(':visible')) {
										$this
												.highlight(submenu
														.children('.ui-menuitem:first'));
									} else {
										$this.activate(currentitem);
										$this
												.highlight(submenu
														.children('.ui-menuitem:first'));
									}
								}
							}
							break;

						case keyCode.UP:
							if (!isRootLink || $this.cfg.vertical) {
								var prevItem = $this.findPrevItem(currentitem);
								if (prevItem.length) {
									$this.deactivate(currentitem);
									$this.highlight(prevItem);
								}
							}

							e.preventDefault();
							break;

						case keyCode.DOWN:
							if (isRootLink && !$this.cfg.vertical) {
								var submenu = currentitem
										.children('ul.ui-menu-child');
								if (submenu.is(':visible')) {
									var firstMenulist = $this
											.getFirstMenuList(submenu);
									$this
											.highlight(firstMenulist
													.children('.ui-menuitem:visible:first'));
								} else {
									$this.activate(currentitem);
								}
							} else {
								var nextItem = $this.findNextItem(currentitem);
								if (nextItem.length) {
									$this.deactivate(currentitem);
									$this.highlight(nextItem);
								}
							}

							e.preventDefault();
							break;

						case keyCode.ENTER:
							var currentLink = currentitem
									.children('.ui-menuitem-link');
							currentLink.trigger('click');
							$this.jq.blur();
							// PrimeFaces.utils.openLink(e, currentLink);
							break;

						}

					});
};