Prado\Web\UI\ActiveControls\TActiveImageButton::setImageUrl PHP Method

    public function setImageUrl($value)
    {
        if (parent::getImageUrl() === $value) {
            return;
        }
        parent::setImageUrl($value);
        if ($this->getActiveControl()->canUpdateClientSide()) {
            $this->getPage()->getCallbackClient()->setAttribute($this, 'src', $value);
        }
    }

 protected function createButton($commandName, $text, $causesValidation, $validationGroup)
 {
     if ($this->getButtonType() === TButtonColumnType::LinkButton) {
         $button = new TActiveLinkButton();
     } else {
         if ($this->getButtonType() === TButtonColumnType::PushButton) {
             $button = new TActiveButton();
         } else {
             $button = new TActiveImageButton();
             $button->setToolTip($text);
             if (strcasecmp($commandName, 'Update') === 0) {
                 $url = $this->getUpdateImageUrl();
             } else {
                 if (strcasecmp($commandName, 'Cancel') === 0) {
                     $url = $this->getCancelImageUrl();
                 } else {
                     $url = $this->getEditImageUrl();
                 }
             }
             $button->setImageUrl($url);
         }
     }
     $button->setText($text);
     $button->setCommandName($commandName);
     $button->setCausesValidation($causesValidation);
     $button->setValidationGroup($validationGroup);
     return $button;
 }