Bug 245437 [Preferences] (HEAD) Preference pages not scrollable (accessible) via keyboard
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
while (nodes.hasNext()) {
			IPreferenceNode node = (IPreferenceNode) nodes.next();
			IPreferencePage page = node.getPage();
			if (page instanceof PreferencePage) {
				
				IPreferenceStore store = ((PreferencePage) page).getPreferenceStore();
				if (store != null && store.needsSaving()
						&& store instanceof IPersistentPreferenceStore) {
					try {
						((IPersistentPreferenceStore) store).save();
					} catch (IOException e) {
						String message =JFaceResources.format(
                                "PreferenceDialog.saveErrorMessage", new Object[] { page.getTitle(), e.getMessage() });  
			            Policy.getStatusHandler().show(
			                    new Status(IStatus.ERROR, Policy.JFACE, message, e),
			                    JFaceResources.getString("PreferenceDialog.saveErrorTitle"));                               			                   
										
					}
				}
			}
		}
	}
	/**
	 * Notifies that the window's close button was pressed, the close menu was
	 * selected, or the ESCAPE key pressed.
	 * <p>
	 * The default implementation of this framework method sets the window's
	 * return code to <code>CANCEL</code> and closes the window using
	 * <code>close</code>. Subclasses may extend or reimplement.
	 * </p>