Bug 33488 [Preferences] [Help] F1 help should always give help about the selected page
build I20030227 - Window / Preferences - focus is in tree at left - F1 - it gives you help about the dialog, not the selected page - give the selected page focus - F1 - it gives you help about the page F1 should always give you help about the selected page. It should also give help about the dialog at the same time, if possible (e.g. a link for the page, and a link for the dialog).
bundles/org.eclipse.jface/src/org/eclipse/jface/preference/PreferencePage.java
*/
	private boolean isValid = true;
	/**
	 * Body of page.
	 */
	private Control body;
	/**
	 * Whether this page has the standard Apply and Defaults buttons; 
	 * <code>true</code> by default.
	 *
	 * @see #noDefaultAndApplyButton
	 */
	private boolean createDefaultAndApplyButton = true;
	/**
	 * Standard Defaults button, or <code>null</code> if none.
	 * This button has id <code>DEFAULTS_ID</code>.
	 */
	private Button defaultsButton = null;
	/**
	 * The container this preference page belongs to; <code>null</code>
	 * if none.
	 */
	private IPreferencePageContainer container = null;
	/**
	 * Standard Apply button, or <code>null</code> if none.
	 * This button has id <code>APPLY_ID</code>.
	 */
	private Button applyButton = null;
	/**
	 * Description label.