Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21EditorStackPresentation.java
*/
	public IMenuManager getSystemMenuManager() {
		return systemMenuManager;
	}
	/**
	 * Shows the system context menu at the specified location
	 * 
	 * @param point
	 */
	protected void showSystemMenu(Point point) {
		Menu aMenu = systemMenuManager.createContextMenu(tabFolder.getParent());
		systemMenuManager.update(true);
		aMenu.setLocation(point.x, point.y);
		aMenu.setVisible(true);
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.skins.Presentation#getControl()
	 */
	public Control getControl() {
		return tabFolder;
	}
	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.internal.skins.StackPresentation#dragOver(org.eclipse.swt.widgets.Control,
	 *      org.eclipse.swt.graphics.Point)
	 */
	public StackDropResult dragOver(Control currentControl, Point location) {