Bug 48364 PreferenceDialog can reopen empty
20031209 When you close the Preferences dialog with an entry other than the default selected you will get an empty entry in the dialog when you reopen STEPS 1) Open the preferences dialog 2) Select the Appearances page 3) Close the dialog 4) Reopen - Workbench will be selected and the contents will be empty
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
Composite titleComposite = new Composite(composite, SWT.NONE);
		GridLayout layout = new GridLayout();
		layout.marginHeight = 0;
		layout.marginWidth = 0;
		layout.verticalSpacing = 0;
		layout.horizontalSpacing = 0;
		titleComposite.setLayout(layout);
		titleComposite.setLayoutData(new GridData(GridData.FILL_HORIZONTAL));
		createTitleArea(titleComposite);
		
		pageContainer = createPageContainer(composite);
		pageContainer.setLayoutData(new GridData(GridData.FILL_BOTH));
		
		Label separator = new Label(composite, SWT.HORIZONTAL | SWT.SEPARATOR);
		GridData gd = new GridData(GridData.FILL_HORIZONTAL);
		gd.horizontalSpan = 2;
		separator.setLayoutData(gd);
		return composite;
	}
	/**
	 * Creates the inner page container.
	 */
	private Composite createPageContainer(Composite parent) {
		Composite result = new Composite(parent, SWT.NULL);
		result.setLayout(new PageLayout());
		return result;
	}
	/**
	 * Creates the wizard's title area.
	 *