public function mergeWith($style)
{
parent::mergeWith($style);
if ($style instanceof TWizardNavigationButtonStyle) {
if ($style->_imageUrl !== null) {
$this->_imageUrl = $style->_imageUrl;
}
if ($style->_buttonText !== null) {
$this->_buttonText = $style->_buttonText;
}
if ($style->_buttonType !== null) {
$this->_buttonType = $style->_buttonType;
}
}
}