ajaxsubmit can't submit returns null - yii

Question

I get an error 200. Form never gets posted, all fields return blank. I also checked if the columns are required, i set everything to null. I have another form that looks like this and it works fine. Any ideas?
<?php $form=$this->beginWidget('CActiveForm', array(
'id'=>'thisForm',
)); ?>
//form
<?php
echo CHtml::ajaxSubmitButton('Add',
Yii::app()->createUrl("url/controller"),
array(
'type'=>'POST',
'dataType'=>'text json',
'data'=>'js:$("#thisForm").serialize()',
'success'=>'js:function(data) {
if(data.status=="success")
$.fn.yiiGridView.update("osb123");
}',
'error'=>'function (xhr, ajaxOptions, thrownError) {
alert(xhr.status);
alert(thrownError);
}'
));
?>
public function actionController()
{
$model=new Model;
if($_POST['Model'])
{
$model->attributes=$_POST['Model'];
$model->temporary_id = Yii::app()->user->user_id;
$model->cost = floatval($_POST['Model']['cost']);
$model->active = "Y";
if($model->validate()){
echo CJSON::encode(array('status'=> 'success',
'data'=>var_dump($_POST['Model'])
));
}
else{
$error = CActiveForm::validate($model);
echo CJSON::encode(array('status'=> 'error', 'error'=>var_dump($_POST['Model'])));
}
}else echo CJSON::encode(array('status'=>'error','error'=>'Not Set'));
}

Answer 1

In the ajax button for url you set: Yii::app()->createUrl("url/controller") while usually the right syntax is Yii::app()->createUrl("controller/action") Could you with debugging tool (Ctrl+Shift+I or F12) check the POST-request and see the actual url that has been generated by yii?
You have beginWidget, do you also have endWidget ?