Переключение между Balloon в Яндекс картах

Как сделать переключение между balloon?

      <script type="text/javascript">
ymaps.ready(init);
function init() {
    var myMap = new ymaps.Map("map", {
        center: [<?php echo $list[0]['point']; ?>],

        zoom: 16
    }, 
    {
        searchControlProvider: 'yandex#search'

    });
 
var myButton1 =
  new ymaps.control.Button(
    '<b>Далее</b>'
  );

  
myMap.controls.add(myButton1, {
  float: "left"
});

var myButton2 =
  new ymaps.control.Button(
    '<b>Назад</b>'
  );

  
myMap.controls.add(myButton2, {
  float: "left"
});


    var myCollection = new ymaps.GeoObjectCollection(); 
 
    <?php foreach ($list as $row): ?>
    var myPlacemark = new ymaps.Placemark([
        <?php echo $row['point']; ?>
    ], {
           balloonContentHeader: '<?php echo $row['adres']; ?>',
        
        balloonContentBody: '<img src="uploads/<?  echo $row['name_image']  ?>" height="150" width="200"> <br/> ' +
            '<a href="single-property-page-1.php?id=<? echo $row['id_room']; ?>">Подробнее</a><br/>' 
     
    }, {
        preset: 'islands#icon',
        iconColor: '#274abb'
    });
myButton1.events
  .add(
    'press',
    function () {
     myMap.panTo(

    [<?php echo $list[0]['point']; ?>], {
          
        flying: true
    }
);
    }
  )


    myCollection.add(myPlacemark);
    <?php endforeach; ?>
 
    myMap.geoObjects.add(myCollection);
    
    myMap.setBounds(myCollection.getBounds(),{checkZoomRange:true, zoomMargin:9});

        myPlacemark.balloon.open();

}
</script>