Bug 336684 [JFace] NPE in Tray Dialog
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/TrayDialog.java
*/
	private Control trayControl;
	
	/**
	 * The control that had focus before the tray was opened (null if none).
	 */
	private Control nonTrayFocusControl;
	
	/*
	 * The separator to the left of the sash.
	 */
	private Label leftSeparator;
	
	/*
	 * The separator to the right of the sash.
	 */
	private Label rightSeparator;
	
	/*
	 * The sash that allows the user to resize the tray.
	 */
	private Sash sash;
	
	/*
	 * Whether or not help is available for this dialog.
	 */
	private boolean helpAvailable = isDialogHelpAvailable();
	
	private int shellWidth;
	private ControlAdapter resizeListener;