show content in plgins layout

Hi,

I have a plugin and it does a ajax call to a Controller inside of my plugin, it's is correct, but, when I show the result of the content, it's does not appear.

in my controller a have:

public function form(){

        Configure::write('debug', 0);

        $this->layout = 'ajax';

        $var = '123';

        $this->set('data', $var);

    }

and i have a View/Layouts/ajax.ctp with

<?php echo $this->fetch('content'); ?>

Ps.: I've only this code in my ajax.ctp layout (and some comments)

and this is my View/[pluginControllerName]/form.ctp

<form>

    <input type="text"/>

    <input type="button" value="ok"/>

    <br/>

    <?php echo $data ?>

</form>

so, the result is:

  

Amigos adicionados: 

the $data value, not appears, someone know what's up?

Ps.: in my test the value of $data is a constant

It's like if   $this->fetch('content'); not working or $data value is empty

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