Bug 29163 SafeRunnable needs to be accessible in JFace
We need to be able to access the SafeRunnable in JFace in order that some error protection can be added to preferences and properties dialogs.
bundles/org.eclipse.ui.workbench/extensions/org/eclipse/jface/wizard/Wizard.java
* Method declared on IWizard.
 */
public int getPageCount() {
	return pages.size();
}
/* (non-Javadoc)
 * Method declared on IWizard.
 */
public IWizardPage[] getPages() {
	return (IWizardPage[])pages.toArray(new IWizardPage[pages.size()]);
}
/* (non-Javadoc)
 * Method declared on IWizard.
 * The default behavior is to return the page that 
 * was added to this wizard before the given page.
 */
public IWizardPage getPreviousPage(IWizardPage page) {
	int index = pages.indexOf(page);
	if (index == 0 || index == -1)
		
		return null;
	else
		return (IWizardPage)pages.get(index - 1);
}
/**
 * Returns the wizard's shell if the wizard is visible. Otherwise
 * <code>null</code> is returned.
 */
public Shell getShell() {
	if (container == null)