modal window

In my modal window i have given the values for updation but the values whichever iam giving is not getting updated can any one tell me the exact solution and i have attached codings along with it

<?php Modal::begin([

'header' => '<h2>Hello world</h2>',


'toggleButton' => ['label' => 'click me'],

]);

echo $this->render(’_form’, [

    'model' => $model,


]);

Modal::end();

?>