TbHtml::formActions PHP Method

    public static function formActions($actions, $htmlOptions = array())
    {
        self::addCssClass('form-actions', $htmlOptions);
        if (is_array($actions)) {
            $actions = implode(' ', $actions);
        }
        // todo: remove this
        $labelWidthClass = TbArray::popValue('labelWidthClass', $htmlOptions, self::$defaultFormLabelWidthClass);
        $controlWidthClass = TbArray::popValue('controlWidthClass', $htmlOptions, self::$defaultFormControlWidthClass);
        // todo: remove everything that has to do with form layout
        if (TbArray::popValue('formLayout', $htmlOptions, self::FORM_LAYOUT_VERTICAL) == self::FORM_LAYOUT_HORIZONTAL) {
            self::addCssClass(self::switchColToOffset($labelWidthClass), $htmlOptions);
            self::addCssClass(self::switchOffsetToCol($controlWidthClass), $htmlOptions);
            return self::tag('div', array('class' => 'form-group'), self::tag('div', $htmlOptions, $actions));
        } else {
            return self::tag('div', $htmlOptions, $actions);
        }
    }

                <p class="text-center"><?php 
    echo Yii::t('app', 'Please input new password for ');
    ?>
                    <strong><?php 
    echo $model->username;
    ?>
</strong>

                    <?php 
    echo $form->errorSummary($model);
    ?>
                    <?php 
    echo $form->textFieldControlGroup($model, 'password', array('class' => 'span4', 'placeholder' => Yii::t('app', 'new password')));
    ?>

            </div>
            
            <?php 
    echo TbHtml::formActions([TbHtml::submitButton(Yii::t('app', 'Change password'), ['color' => TbHtml::BUTTON_COLOR_PRIMARY])]);
    ?>

        <?php 
}
?>

        <?php 
$this->endWidget();
?>
    </div>
</div><!-- form -->