final Stage stage = Stage.createStage();
stage.setContent(
new GridBox()
.createColumn(50,GridBox.Align.Right)
.createColumn(50,GridBox.Align.Fill)
.addControl(new Label("Please visit Flickr and grant Leo access to your account"))
.nextRow()
.addControl(new Spacer())
.addControl(new Button("Goto Flickr").onClicked(new Callback<ActionEvent>() {
public void call(ActionEvent event) {
OSUtil.openBrowser(url.toExternalForm());