Problem returning a view edit_colunm or add_colunm

[victor-rincon]

I'm trying to make a call_back bring me a view in the datatable but I get a problem this is my code:

Model

    public function usuarioDataTableJson()
    {   
        // We loaded the helper that generates buttons
        $this->load->helper('botones');
        $this->datatables
        ->select("usuarioId AS checkbox, usuarioId, usuario, perfil, empleado, empresa, departamento", FALSE)
        ->from('vista_usuarios')
        ->edit_column('checkbox', '<label><input type="checkbox" class="ace" name="usuarios[]" value="$1" /><span class="lbl"></span></label>', 'usuarioId')
        ->add_column('action', '$1', 'crearBotonAccion(usuarioId, "usuario", empleado, "editar")');

        return $this->datatables->generate();
    }

Helper

    function crearBotonAccion($ID=0,$modulo='',$titulo='',$accion='')
    {   
        $CI =& get_instance();
        $CI->load->library('session');
        $arrayKey= array();
        $data = array();
        foreach ($CI->session->userdata('SubModulos') as $value) {
                $arrayKey =  array(
                    'agregar' => $value->agregar,
                    'ver' => $value->ver,
                    'editar' => $value->editar,
                    'eliminar' => $value->eliminar,
             );
                $data = array(
                    'urlAgregar' =>base_url().strtolower($titulo).'/'.$accion,
                    'url' => base_url().strtolower($titulo).'/'.$accion.'/'.$ID,
                    'titulo' => strtolower($titulo),
                    'accion' => $accion,
                    'id' => $titulo."_".$accion,
                 );
            if($value->nombre == $modulo && $arrayKey[$accion] =='si')
            {

                return $CI->load->view("botones/".$accion, $data);

            }       
        }
    }

If it can be noted in the method we introduce edit_column HTML, here everything goes well

edit_column('checkbox', '<label><input type="checkbox" class="ace" name="usuarios[]" value="$1" /><span class="lbl"></span></label>', 'usuarioId')

But the method add_column where I have a function that returns me a view instead of retornarme html, I get an error

->add_column('action', '$1', 'crearBotonAccion(usuarioId, "usuario", empleado, "editar")')

return $CI->load->view("botones/".$accion, $data);