// for updating GUI on fuel tank selection
private void SelectFuelTank(FuelTank fuelTank)
{
// setting values of the selected fueltank
SelectedFuelTankLabel.Content = fuelTank.GetFuelType().GetFuelTypeName() + " Tank";
FuelTankFilling.Content = fuelTank.GetCurrentFuelAmount().ToString() + "/" + fuelTank.GetMaxCapacity().ToString() + "L";
FuelTankPercentage.Content = fuelTank.GetFillPercentage().ToString("n2") + "%";
selectedFuelTank = fuelTank;
}