function onTap ( event ) {

	            event.preventDefault();
	            event.stopPropagation();

	            let mainMenu = scope.mainMenu, subMenu = this.subMenu;

	            function onNextTick () {

	                mainMenu.changeSize( subMenu.clientWidth );
	                subMenu.show();
	                subMenu.unslideAll();

	            }

	            mainMenu.hide();
	            mainMenu.slideAll();
	            mainMenu.parentElement.appendChild( subMenu );

	            scope.activeMainItem = this;
	            scope.activeSubMenu = subMenu;

	            window.requestAnimationFrame( onNextTick );

	        }
Create main menu
@param  {array} menus - Menu array list
@memberOf Widget
@instance
@return {HTMLElement} - A span element