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Remove widget from layout mananger (Smart GWT)

/*  * SmartGWT (GWT for SmartClient)  * Copyright 2008 and beyond, Isomorphic Software, Inc.  *  * SmartGWT is free software; you can redistribute it and/or modify it  * under the terms of the GNU Lesser General Public License version 3  * as published by the Free Software Foundation.  SmartGWT is also  * available under typical commercial license terms - see  * http://smartclient.com/license  * This software is distributed in the hope that it will be useful,  * but WITHOUT ANY WARRANTY; without even the implied warranty of  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU  * Lesser General Public License for more details.  */ package com.smartgwt.sample.showcase.client; import com.google.gwt.core.client.EntryPoint; import com.google.gwt.user.client.ui.RootPanel; import com.smartgwt.client.types.Alignment; import com.smartgwt.client.types.DragAppearance; import com.smartgwt.client.types.Overflow; import com.smartgwt.client.widgets.Canvas; import com.smartgwt.client.widgets.IButton; import com.smartgwt.client.widgets.Label; import com.smartgwt.client.widgets.events.ClickEvent; import com.smartgwt.client.widgets.events.ClickHandler; import com.smartgwt.client.widgets.layout.HLayout; import com.smartgwt.client.widgets.layout.VLayout; public class Showcase implements EntryPoint {   public void onModuleLoad() {     RootPanel.get().add(getViewPanel());   }   public Canvas getViewPanel() {     VLayout layout = new VLayout(15);     final HLayout mainLayout = new HLayout();     mainLayout.setWidth(350);         mainLayout.setShowEdges(true);     mainLayout.setEdgeImage("edges/custom/sharpframe_10.png");     mainLayout.setDragAppearance(DragAppearance.TARGET);     mainLayout.setOverflow(Overflow.HIDDEN);     mainLayout.setCanDragResize(true);     mainLayout.setResizeFrom("L", "R");     mainLayout.setLayoutMargin(10);     mainLayout.setMembersMargin(10);     mainLayout.setMinWidth(100);     mainLayout.setMinHeight(50);     final Label member1 = new Label();     member1.setContents("Member 1");     member1.setOverflow(Overflow.HIDDEN);     member1.setShowEdges(true);     member1.setCanDragResize(true);     member1.setResizeFrom("L", "R");     member1.setAlign(Alignment.CENTER);     Label member2 = new Label();     member2.setContents("Member 2");     member2.setOverflow(Overflow.HIDDEN);     member2.setShowEdges(true);     member2.setCanDragResize(true);     member2.setResizeFrom("L", "R");     member2.setAlign(Alignment.CENTER);     mainLayout.addMember(member1);     mainLayout.addMember(member2);     mainLayout.setHeight(100);     HLayout buttonLayout = new HLayout(15);     final IButton removeMember = new IButton("Remove Member 1");     removeMember.setWidth(140);          final IButton addMember = new IButton("Add Member 1");     addMember.setDisabled(true);     removeMember.addClickHandler(new ClickHandler() {         public void onClick(ClickEvent event) {             Canvas[] children = mainLayout.getChildren();             mainLayout.removeChild(member1);             removeMember.disable();             addMember.enable();         }     });     buttonLayout.addMember(removeMember);     addMember.addClickHandler(new ClickHandler() {         public void onClick(ClickEvent event) {             mainLayout.addMember(member1);             addMember.disable();             removeMember.enable();         }     });     buttonLayout.addMember(addMember);     layout.addMember(mainLayout);     layout.addMember(buttonLayout);     return layout;   } }                  SmartGWT.zip( 9,880 k)