private void makeVisible(IWizardPage page) {
   if (fVisiblePage == page) return;
   if (fVisiblePage != null) fVisiblePage.setVisible(false);
   fVisiblePage = page;
   fPageContainer.showPage(page.getControl());
   fVisiblePage.setVisible(true);
 }
 /** @see org.eclipse.jface.wizard.IWizard#getPreviousPage(org.eclipse.jface.wizard.IWizardPage) */
 @Override
 public IWizardPage getPreviousPage(IWizardPage thePage) {
   IWizardPage pPage = super.getPreviousPage(thePage);
   pPage.setVisible(true);
   return pPage;
 }