public function addItem($caption, $href="#") {
		if($caption instanceof HtmlDropdownItem){
			$item=$caption;
		}else{
			$iid=$this->getItemsCount()+1;
			$item=new HtmlDropdownItem($this->identifier."-dropdown-item-".$iid);
			$item->setCaption($caption)->setHref($href);
		}
		$this->items []=$item;
		return $item;
	}