Yii Booster Modal Or Jui Dialogs

I'm trying to render diferents forms or views in a Jquery dialog or a Modal dialog, but the renderPartial does something anoying.

First I tried to update the content of a div or the dialog itself like this:

$("#modal_body").html("<?php $this->renderPartial("_do_form", array("model" => $model), false,false);?>");

obviously that code its loaded from a button with an 'onclick' javascript function or an event. But it loads the hole partial view within the main view. This works fine:

$("#modal_body").html("Hola");

Last thing that worked for me using a JQuery Dialog it's the next ajax call:

'ajaxOptions' => array(
        'success' => 'js:function(data){
            $("#dialog_content").html(data);
            $("#dialog-form").dialog({title: "Establecer Salidas Digitales", position: ["top",75]});
            $("#dialog-form").dialog("option", "height", 325);
            $("#dialog-form").dialog("option", "width", 500);
            $("#dialog-form").dialog("open");
        }'

In the controller I have this:

$newDO = new DigitalOutput;
$this->renderPartial('_do_form', array(
                'model' => $newDO,
            ),false,true);

But its very slow, so I'm wonder if there is a better way to do that. I'm a Rails developer and I'm wonder if there is a way to do something like this:

$('#agent2').html("<%= escape_javascript( render(:partial => 'partial_name') ) %>");