function test() {
  var ss = SpreadsheetApp.getActiveSpreadsheet();
  var app = UiApp.createApplication();

  // create a button and handler
  var buttonHandler = app.createServerHandler("buttonTest");
  var button = app.createButton("Button Test");
  button.addClickHandler(buttonHandler)

  app.add(button)
  ss.show(app); // Display the app
}
function buttonTest(e) {
  // nothing here is executed
}