Bug 113575 [Dialogs] opening a dialog on top of PopupDialog closes the popup
bundles/org.eclipse.jface/src/org/eclipse/jface/dialogs/PopupDialog.java
* Shell style appropriate for a simple hover popup that cannot get focus.
	 */
	public final static int HOVER_SHELLSTYLE = SWT.NO_FOCUS | SWT.ON_TOP
			| SWT.NO_TRIM;
	/**
	 * Shell style appropriate for an info popup that can get focus.
	 */
	public final static int INFOPOPUP_SHELLSTYLE = SWT.NO_TRIM | SWT.ON_TOP;
	/**
	 * Shell style appropriate for a resizable info popup that can get focus.
	 */
	public final static int INFOPOPUPRESIZE_SHELLSTYLE = SWT.RESIZE;
	/**
	 * Border thickness in pixels.
	 */
	private static final int BORDER_THICKNESS = 1;
	/**
	 * The dialog's toolbar for the move and resize capabilities.
	 */
	private ToolBar toolBar = null;
	/**
	 * The dialog's menu manager.
	 */
	private MenuManager menuManager = null;
	/**
	 * The control representing the main dialog area.
	 */
	private Control dialogArea;
	/**
	 * Labels that contain title and info text. Cached so they can be updated