Bug 155650 [Preferences] Accessibility: Tab can't access to the "Forward to..." Split button on Preferences window
Steps to reproduce bug: 1.Launch Eclipse 3.2. 2.Goto Preferences window. 3.Select 'Java' (or anyother) on the left pane. 4.Then select 'Help' (or anyother) on the left pane. 5.Click the right-top split button 'Back to Java'. 6.Use Tab Key to access to navigate the control. DEFECT: Notice that you cannot navigate to the navigation-split button.
bundles/org.eclipse.jface/src/org/eclipse/jface/action/ToolBarManager.java
*            the tool bar item style
	 * @see org.eclipse.swt.widgets.ToolBar for valid style bits
	 */
	public ToolBarManager(int style) {
		itemStyle = style;
	}
	/**
	 * Creates a tool bar manager for an existing tool bar control. This manager
	 * becomes responsible for the control, and will dispose of it when the
	 * manager is disposed.
	 * 
	 * @param toolbar
	 *            the tool bar control
	 */
	public ToolBarManager(ToolBar toolbar) {
		this();
		this.toolBar = toolbar;
	}
	/**
	 * Creates and returns this manager's tool bar control. Does not create a
	 * new control if one already exists.
	 * 
	 * @param parent
	 *            the parent control
	 * @return the tool bar control
	 */
	public ToolBar createControl(Composite parent) {
		if (!toolBarExist() && parent != null) {
			toolBar = new ToolBar(parent, itemStyle);
			toolBar.setMenu(getContextMenuControl());