Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21EditorStackPresentation.java
* (non-Javadoc)
	 * 
	 * @see org.eclipse.ui.presentations.StackPresentation#showPaneMenu()
	 */
	public void showPaneMenu() {
		IPartMenu menu = getPartMenu();
		if (null != menu) {
			CTabItem tab = getTab(getCurrentPart());
			if (null != tab && null != tab.getControl()) {
				Rectangle bounds = DragUtil.getDisplayBounds(tab.getControl());
				menu.showMenu(new Point(bounds.x, bounds.y + bounds.height));
			}
		}
	}
	/**
	 * Returns the IPartMenu for the currently selected part, or null if the
	 * current part does not have a menu.
	 * 
	 * @return the IPartMenu for the currently selected part or null if none
	 */
	protected IPartMenu getPartMenu() {
		IPresentablePart part = getCurrentPart();
		if (part == null) {
			return null;
		}
		return part.getMenu();
	}
	/*
	 * (non-Javadoc)
	 *