Bug 168888 [Wizards] PageTransition classes may need rename/reorg
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
if (page.getControl() == null) {
            page.createControl(pageContainer);
            
            
            Assert.isNotNull(page.getControl());
            
            updateSize(page);
        }
        
        IWizardPage oldPage = currentPage;
        currentPage = page;
        
        currentPage.setVisible(true);
        if (oldPage != null) {
			oldPage.setVisible(false);
		}
        
        update();
    }
    /**	
     * Shows the starting page of the wizard.
     */
    private void showStartingPage() {
        currentPage = wizard.getStartingPage();
        if (currentPage == null) {
            
            return;
        }