Cbuttoncolumn Url

Why is is that I can echo the correct value when echoing $tempSeats but when I try and place the variable in the CButtonColumn 'url' field it does not display anything? I have tried numerous solutions to get the variable to show up in the url with no success. Am I missing something easy?

<?php 

$tempSeats = Yii::app()->getRequest()->getQuery('adult-list');

echo $tempSeats;

$this->widget('zii.widgets.grid.CGridView', array(
	'id'=>'my-list',
	'dataProvider'=>$model->searchFlights(),
	'filter'=>$model,
	'columns'=>array(
		'departTime',
		'departLocation',
		'departDay',
		'arrivalTime',
		'arrivalLocation',
		'price',
		'totalSeats',
		array(
			'header'=>'Seats',
			'value'=>'0',
			'id'=>'adultSeats',
			),
		/*
		
		'allowDogs',
		*/
		array(
    'class'=>'CButtonColumn',
    'template'=>'{book}',
    'buttons'=>array
    (
        'book' => array
        (
            'label'=>'Book Now',
            'url'=>'$this->grid->controller->createUrl("/bookings/createBooking/flightID/$data->flightID/", array("tempSeats"=>$tempSeats))',
        ),
    ),
),
	),
)); ?>