This Layout stacks all the controls one on top of the other and resizes all controls to have the same size and location. The control specified in topControl is visible and all other controls are not visible. Users must set the topControl value to flip between the visible items and then call layout() on the composite which has the StackLayout.
Copyright (c) 2000, 2008 IBM Corporation and others. All rights reserved. This program and the accompanying materials are made available under the terms of the Eclipse Public License v1.0 which accompanies this distribution, and is available at http://www.eclipse.org/legal/epl-v10.html
Contributors: IBM Corporation - initial API and implementation Port to the D programming language: Frank Benoit <benoit@tionex.de>