Label expander = new Label();
gl.addComponent(expander, 1, 0);
gl.setColumnExpandRatio(1, 1);
gl.addComponent(
new PopupView("Click here to popup", new Label("test")), 0, 0);
gl.addComponent(
new PopupView("Click here to popup", new Label("test")), 2, 0);
addComponent(gl);
}