yii2

h1. Listas

echo $form->listBox($model,'products',CHtml::listData($pmodel,'product','description'),array('multiple'=>'multiple','size'=>'10','options'=>array(  'Beer'=>array('selected'=>'selected'), 'Wine'=>array('selected'=>'selected') )));

<pre>

<?php echo $form->dropDownList($model,'idposicioniva', array('1'=>'Exento',2 => 'Monotributista', 3=> 'Iva Inscripto'), array('options' => array('1'=>array('selected'=>true)))) ?>

</pre>

Listado de seleccion en recuadro

<pre>

<?= $form->field($model, 'idposicioniva')-> listBox(

   array('1'=>'Exento',2 => 'Monotributista', 3=> 'Iva Inscripto'),

   array('prompt'=>'Select')

   ); ?>

</pre>

Lista de Seleccion Multiple

<pre>

<?= $form->field($model, 'idposicioniva')->listBox( array('1'=>'Exento',2 => 'Monotributista', 3=> 'Iva Inscripto'), [

    'multiple' => true,

    'size' => 7,

]) ?>

</pre> 

con datos del modelo

<pre>

<?= $form->field($model, 'idposicioniva')->listBox(app\models\Appointment::getWeekdaysList(), [

    'multiple' => true,

    'size' => 7,

]) ?>

</pre>