Back stack handling in Conductor

I try to use Conductor library but have a problem with backstack. I have an activity with 4 buttons in bottom navigation panel. Each of the buttons in ACTIVITY opens 1 of the 4 controllers: - today news (root controller) - trending news - market news - regulatory news

I need to add all controlers to backstack, and when i tap on the back button i must return to previous controller. For example: Today -> Market -> Trending If i tap on the back button in Trending controller, i must to return to Market e.t.c. But now activity is closing when i tap on the back in any controller. How can i implement this behavior? This is the code in my activity:

    @Override
public void navigateToMarketHighlights() {
    MarketHighlightsController marketHighlightsController = new MarketHighlightsController();

    router.pushController(RouterTransaction.with(marketHighlightsController)
            .popChangeHandler(new FadeChangeHandler())
            .pushChangeHandler(new FadeChangeHandler()));
}

@Override
public void navigateToTrendingNow() {
    TrendingNowController trendingNowController = new TrendingNowController();

    router.pushController(RouterTransaction.with(trendingNowController)
            .popChangeHandler(new FadeChangeHandler())
            .pushChangeHandler(new FadeChangeHandler()));
}

@Override
public void navigateToTodayView() {
    TodayController todayController = new TodayController();

    router.pushController(RouterTransaction.with(todayController)
            .popChangeHandler(new FadeChangeHandler())
            .pushChangeHandler(new FadeChangeHandler()));
}

@Override
public void navigateToRegulatoryUpdatesView() {
    RegulatoryUpdatesController regulatoryUpdatesController = new RegulatoryUpdatesController();
    router.pushController(RouterTransaction.with(regulatoryUpdatesController)
            .popChangeHandler(new FadeChangeHandler())
            .pushChangeHandler(new FadeChangeHandler()));
}