val source = button("Show Dialog").actionEvents().flatMap {
          Alert(Alert.AlertType.CONFIRMATION,"Are you sure?")
                  .toObservable()
                  .map { it == ButtonType.OK }
      }.publish().refCount()

 source.subscribe { println("SUB 1 received: $it") }
 source.subscribe { println("SUB 2 received: $it") }