EventBus.getInstance().addObserver(InsertedRequestForGroupMembershipResponseEvent.class,
new Observer<InsertedRequestForGroupMembershipResponseEvent>()
{
public void update(final InsertedRequestForGroupMembershipResponseEvent inArg1)
{
button.disable();
EventBus.getInstance()
.notifyObservers(
new ShowNotificationEvent(new Notification(
"Your request for access has been sent")));
}