Bug 63420 [R21PRES] Flash on tab switch
bundles/org.eclipse.ui.presentations.r21/src/org/eclipse/ui/internal/presentations/R21BasicStackPresentation.java
paneFolder = control;
		shellActive = paneFolder.getControl().getShell().equals(
				control.getControl().getDisplay().getActiveShell());
		
		
						
		titleLabel = new CLabel(paneFolder.getControl(), SWT.SHADOW_NONE);
		titleLabel.setVisible(false);
		titleLabel.moveAbove(null);
		titleLabel.addMouseListener(titleMouseListener);
		titleLabel.addMouseListener(mouseListener);
		titleLabel.addListener(SWT.MenuDetect, menuListener);
		PresentationUtil.addDragListener(titleLabel, dragListener);
		
		viewToolBar = new ToolBar(control.getControl(), SWT.HORIZONTAL
				| SWT.FLAT);
		viewToolBar.moveAbove(null);
		pullDownButton = new ToolItem(viewToolBar, SWT.PUSH);
		
		
		Image hoverImage = WorkbenchImages
				.getImage(IWorkbenchGraphicConstants.IMG_LCL_VIEW_MENU);
		pullDownButton.setDisabledImage(null); 
		
		pullDownButton.setImage(hoverImage);
		pullDownButton.setToolTipText(R21PresentationMessages
				.getString("BasicStackPresentation.menu.tooltip")); $NON-NLS-1$
		pullDownButton.addSelectionListener(new SelectionAdapter() {
			public void widgetSelected(SelectionEvent e) {
				showPaneMenu();