Bug 120921 [PopupDialog] Keybindings lost after using PopupDialog
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
list.add(infoLabel);
		if (titleSeparator != null)
			list.add(titleSeparator);
		if (infoSeparator != null)
			list.add(infoSeparator);
		return list;
	}
	/**
	 * Return a list of controls which should never have their background color
	 * reset. Subclasses may extend this method (should always call
	 * <code>super.getBackgroundColorExclusions</code> to aggregate the list.
	 * 
	 * @return the List of controls
	 */
	protected List getBackgroundColorExclusions() {
		List list = new ArrayList(2);
		if (titleSeparator != null)
			list.add(titleSeparator);
		if (infoSeparator != null)
			list.add(infoSeparator);
		return list;
	}
	/**
	 * Initialize any state related to the widgetry that should be set up each
	 * time widgets are created.
	 */
	private void initializeWidgetState() {
		menuManager = null;
		dialogArea = null;
		titleLabel = null;