- (id)init
{
    if ((self = [super init]))
    {
        // create our two buttons
        SPButton *yesButton = ...;
        SPButton *noButton = ...;
        
        // add them to the display tree
        [self addChild:yesButton];
        [self addChild:noButton];
        
        // listen for their TRIGGERED events
        [yesButton addEventListener:@selector(onYesTriggered:) atObject:self
                            forType:SP_EVENT_TYPE_TRIGGERED];
        
        [noButton addEventListener:@selector(onNoTriggered:) atObject:self
                           forType:SP_EVENT_TYPE_TRIGGERED];
    }
    return self;
}

// the listener we created for the yes-button:
- (void)onYesTriggered:(SPEvent *)event
{
    SPEvent *localEvent = [SPEvent eventWithType:EVENT_TYPE_YES_TRIGGERED];
    [self dispatchEvent:localEvent];
}

// the listener we created for the no-button:
- (void)onNoTriggered:(SPEvent *)event
{
    SPEvent *localEvent = [SPEvent eventWithType:EVENT_TYPE_NO_TRIGGERED];
    [self dispatchEvent:localEvent];
}