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') )));


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

Listado de seleccion en recuadro

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

Lista de Seleccion Multiple

<?= $form->field($model, 'idposicioniva')->listBox( array('1'=>'Exento',2 => 'Monotributista', 3=> 'Iva Inscripto'), [
    'multiple' => true,
    'size' => 7,
]) ?>

con datos del modelo

<?= $form->field($model, 'idposicioniva')->listBox(app\models\Appointment::getWeekdaysList(), [
    'multiple' => true,
    'size' => 7,
]) ?>

Esto funcionaba

 <?= $form->field($model, 'idestado')->dropDownList(
        array('1'=>'Aspirante',2 => 'Alumno', 3=> 'Egresado', 4=> 'Baja', 3=> 'Pase'),
        array('options' => array('2'=>array('selected'=>true)))

    ) ?>
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