code: public boolean showNextPage(AbstractWizardPage nextPage) {
  		if (nextPage == null) {
  			// Next page is null. Updating buttons and ignoring request.
  			updateButtons();
  			return false;
  		}
  		if (currentPage != null) {
  			pageHistory.push(currentPage);
  		}
  		setPage(nextPage);
  		return true;
  	}
docs: Sets the current page of this wizard to the specified page and adds the previous "current page" to the history.
  
  @param nextPage
  the page to set as the current page
  @return <code>true</code> if the current page was changed, otherwise <code>false</code>