/**
* Constructs a standard next button
*
* @return build button
*/
protected Button prepareNextButton() {
return prepareNextButton(constants.next());
}
/**
* Constructs a standard previous button
*
* <p>If current step is the first step, so we return null
*
* @return
*/
protected Button preparePreviousButton() {
return preparePreviousButton(constants.previous());
}