/**
     * Registers necessary client scripts.
     */
    public function registerClientScript()
    {
        parent::registerClientScript();

        $cs=Yii::app()->getClientScript();
        $cs->registerScriptFile($this->baseJuiUrl.'/jquery.ui.core.min.js',CClientScript::POS_END);
        $cs->registerScriptFile($this->baseJuiUrl.'/jquery.ui.widget.min.js',CClientScript::POS_END);
        $cs->registerScriptFile($this->baseJuiUrl.'/jquery.ui.mouse.min.js',CClientScript::POS_END);
        $cs->registerScriptFile($this->baseJuiUrl.'/jquery.ui.droppable.min.js',CClientScript::POS_END);
        $cs->registerScriptFile($this->baseJuiUrl.'/jquery.ui.draggable.min.js',CClientScript::POS_END);
        
        $baseUrl = Y::curBaseUrl();
        
        $cs->registerScript('draganddrop', '
            $(document).ready(function()  {
               $("#'.$this->getId().' tbody tr").live("mouseenter", function() {
	              var $this = $(this);
	              if($this.is(":data(draggable)")) return;
				  $this.draggable({
	                  helper: "clone",
	                  opacity: .75,
	                  refreshPositions: true, // Performance?
	                  revert: "invalid",
	                  revertDuration: 300,
	                  scroll: true
	              });
	           });
               $("#'.$this->getId().' tbody tr").live("mouseenter", function() {
               		var $this = $(this);
               		if ($this.is(":data(droppable)")) return;
				    $(this).droppable({
	                    drop: function(e, ui) {
							$("#'.$this->getId().'").addClass("grid-views-loading");
	                    	$.get(
		                    	"'.$baseUrl.'/movePosition",
								{
		                    		pk : $(ui.draggable).attr("id"),
		                    		to : $(this).attr("id")
		                    	},
		                    	function() {
		                    		$.fn.yiiGridView.update("'.$this->getId().'");
		    					}
		                    );
	                    },
	  					hoverClass: "accept",
	               });
               });
            });
		');
    }