Bug 53386 [ActivityMgmt] Remove show All from everywhere except new wizards
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferenceDialog.java
* The current preference page, or <code>null</code> if
	 * there is none.
	 */
	private IPreferencePage currentPage;
	
	private DialogMessageArea messageArea;
	/**
	 * Indicates whether help is available; <code>false</code> by default.'
	 *
	 * @see #setHelpAvailable
	 */
	private boolean isHelpAvailable = false;
	private Point lastShellSize;
	private IPreferenceNode lastSuccessfulNode;
	/**
	 * The minimum page size; 400 by 400 by default.
	 *
	 * @see #setMinimumPageSize
	 */
	private Point minimumPageSize = new Point(400, 400);
	/**
	 * The OK button.
	 */
	private Button okButton;
	/**
	 * The Composite in which a page is shown.
	 */
	private Composite pageContainer;
	/**
	 * The preference manager.