Nestedsetbehavior + Actioncreate

Hi all…ime troubling with the extension nestedsetbehavior

i installed it and i have followed all the instructions that ive found…

my problem its that i dont know how to add code in actionCreate and actionUpadte inside my model

i found this code


                

                       if(isset($_POST['Category']))

                {

                        echo $_POST['Category']['id'] . '<br />';

                        echo $_POST['Category']['title'] . '<br />';

                        

                        $root = Category::model()->findByPk(1);

                        

                        $element=new Category;

                        $element->title=$_POST['Category']['title'];

                        $element->appendTo($root);

                }



but i get this notice


Undefined index: title 

and i cant go ahead…

in my _form.php file i’ve this code


  <div class="row">

 

<?php

        

                $dataArr = array();

                $combo_populate = Category::model()->findAll();

                

                foreach($combo_populate as $comboVal)

                {

                        array_push($dataArr, $comboVal['title']);

                }

                

                echo CHtml::label('Seleziona:','title');

                $this->widget('application.components.widgets.yii-combobox.EJuiComboBox', array(

                        'model' => Category::model(),

                        'attribute' => 'id',

                      //  'attribute' => 'title',

                        'data' => $dataArr,

                        'options' => array(

                                'onSelect' => '',

                                'onChange' => 'alert("changed value : " + $(this).val());',

                                'allowText' => true,

                        ),

                ));

        ?>


    </div>

can anyone help me please… ? thank you very much to all…