How to remove class from the DIV parents from checkboxList() in Yii framework 2

Below is my code to generate a checkbox list in Yii framework 2.

<?php $form = ActiveForm::begin(); ?>
    <?php echo $form->field($model, 'my_property')->checkboxList(['A', 'B', 'C']) ?>
<?php ActiveForm::end(); ?>

This generates the follow HTML checkbox list.

<div class="form-group">
    <label class="control-label" for="my_property">My Property</label>
    <input type="hidden" name="Model[my_property]" value="">
    <div id="model-my_property">
        <div class="checkbox">
            <label>
                <input type="checkbox" name="Model[my_property][]" value="0"> A
            </label>
       </div>
       <div class="checkbox">
            <label>
                <input type="checkbox" name="Model[my_property][]" value="1"> B
            </label>
       </div>
       <div class="checkbox">
            <label>
                <input type="checkbox" name="Model[my_property][]" value="2"> C
            </label>
       </div>
   </div>
   <p class="help-block help-block-error"></p>
</div>

How can I remove the class="checkbox" from the div which directly is surrounding the <label> tag? I have tried template, checkboxTemplate and inputTemplate, with these I can only touch the outer div.