button4.setWidth100();
column2.addMember(button4);
// Button5: Draw Rectangle
IButton button5 = new IButton(I18nProvider.getSampleMessages().renderingDrawRectangle());
button5.addClickHandler(new ClickHandler() {
public void onClick(ClickEvent event) {
map.getVectorContext().drawGroup(map.getGroup(RenderGroup.SCREEN), group2);
ShapeStyle style = new ShapeStyle("#337788", 0.5f, "#337766", 1, 2);
map.getVectorContext().drawRectangle(group2, "rectangle", new Bbox(50, 200, 200, 50), style);