private void addFile() { file = new FileUpload(); file.setHeight("22px"); file.setWidth("100%"); file.setName("file"); file.ensureDebugId("file-uploadFile-ChooseFile"); file.addChangeHandler( new ChangeHandler() { @Override public void onChange(ChangeEvent event) { delegate.onFileNameChanged(); } }); uploadPanel.insert(file, 0); }