Code snippet from BeeStore

SidePanelPresenter.java

@Override
protected void onBind() {
    setInSlot(SLOT_MAIN, shoppingCartPresenter);

    addRegisteredHandler(CheckoutContinueEvent.TYPE, this);
}

@Override
public void onCheckoutContinue(CheckoutContinueEvent event) {
    if (getChildren(SLOT_MAIN).contains(shoppingCartPresenter)) {
        setInSlot(SLOT_MAIN, addressPresenter);
    } else if (event.getSource() == addressPresenter) {
        addToSlot(SLOT_MAIN, orderPresenter);
    } else if (event.getSource() == orderPresenter) {
        addToSlot(SLOT_MAIN, paymentPresenter);
    }
}