AbsolutePanel master_panel=new AbsolutePanel();
//RootPanel rootPanel = RootPanel.get("content");
  master_panel.setStyleName("master_panel");
  master_panel.setHeight("100px");
  master_panel.setWidth("300px");


master_panel.add(step_co,100,25);
RootPanel.get("master").add(master_panel,100,25);
RootPanel.get("content").add(UPLOAD_PROGRESS_VIEW,100,150);
RootPanel.get("content").add(next1);

  next1.addClickHandler(new ClickHandler() {
        public void onClick(ClickEvent event) {
            History.newItem("step2",true);

           RootPanel.get().add(new Label(History.getToken()));

RootPanel.get("content").add(next1,150,550);

History.addValueChangeHandler(this)