public function actionGeneratePdf()
{
$this->layout = 'pdf';
$model = new Usergroup('search');
if (isset($_GET['Usergroup'])) {
$model->attributes = $_GET['Usergroup'];
}
// to execute the filters (if is the case)
$dataProvider = $model->search();
$dataProvider->pagination = false;
$mPDF1 = Yii::app()->ePdf->mpdf();
# You can easily override default constructor's params
$mPDF1 = Yii::app()->ePdf->mpdf('', 'A5');
# renderPartial (only 'view' of current controller)
$mPDF1->WriteHTML($this->renderPartial('admin', array('model' => $model), true));
# Outputs ready PDF
$mPDF1->Output();
}