public void showZonesPanel() { CaptionPanel splitContent = new CaptionPanel(constants.customContentTitle()); splitContent.setWidth("185px"); listOfZoneDesigner = new FlexTable(); listOfZoneDesigner.setWidth("100%"); addRowButton = new Button(constants.addRow()); listOfZoneDesigner.setWidget(0, 1, addRowButton); splitContent.setContentWidget(listOfZoneDesigner); builderContent.add(splitContent); }