Maybe they have some purpose, but it isn't immediately obvious. I tried Tree & List mode, they're never populated.

![image](https://user-images.githubusercontent.com/13134193/33488849-04a2c8a6-d6ed-11e7-85c3-5c05f1ec5346.png)

* Bitcoin-Qt 0.15.1 for Ubuntu 16.04 x64 (from http://ppa.launchpad.net/bitcoin/bitcoin/ubuntu xenial/main amd64)

Note: I just noticed I'm *not* seeing this on Ubuntu 17.10 x64 with 0.15.1 downloaded from bitcoincore.org. 

![image](https://user-images.githubusercontent.com/13134193/33491553-9584dc62-d6f5-11e7-9ba7-e074e0e36151.png)


}
            if (nChange == 0 && !CoinControlDialog::fSubtractFeeFromAmount)
                nBytes -= 34;
        }
        
        nAfterFee = std::max<CAmount>(nAmount - nPayFee, 0);
    }
    
    int nDisplayUnit = BitcoinUnits::BTC;
    if (model && model->getOptionsModel())
        nDisplayUnit = model->getOptionsModel()->getDisplayUnit();
    QLabel *l1 = dialog->findChild<QLabel *>("labelCoinControlQuantity");
    QLabel *l2 = dialog->findChild<QLabel *>("labelCoinControlAmount");
    QLabel *l3 = dialog->findChild<QLabel *>("labelCoinControlFee");
    QLabel *l4 = dialog->findChild<QLabel *>("labelCoinControlAfterFee");
    QLabel *l5 = dialog->findChild<QLabel *>("labelCoinControlBytes");
    QLabel *l7 = dialog->findChild<QLabel *>("labelCoinControlLowOutput");
    QLabel *l8 = dialog->findChild<QLabel *>("labelCoinControlChange");
    
    dialog->findChild<QLabel *>("labelCoinControlLowOutputText")->setEnabled(nPayAmount > 0);
    dialog->findChild<QLabel *>("labelCoinControlLowOutput")    ->setEnabled(nPayAmount > 0);
    dialog->findChild<QLabel *>("labelCoinControlChangeText")   ->setEnabled(nPayAmount > 0);
    dialog->findChild<QLabel *>("labelCoinControlChange")       ->setEnabled(nPayAmount > 0);
    
    l1->setText(QString::number(nQuantity));                                 
    l2->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nAmount));        
    l3->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nPayFee));        
    l4->setText(BitcoinUnits::formatWithUnit(nDisplayUnit, nAfterFee));      
    l5->setText(((nBytes > 0) ? ASYMP_UTF8 : "") + QString::number(nBytes));        
    l7->setText(fDust ? tr("yes") : tr("no"));