<ListBox x:Name="LvOrders" SelectedItem="{Binding SelectedOrder}" ItemsSource="{Binding Orders}">
                <ListBox.Resources>
                  <DataTemplate DataType="{x:Type local:TrackedOrderViewModel}"><Grid Grid.Row="1" Orientation="Vertical" HorizontalAlignment="Left" Width="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=ActualWidth}">
                        <TextBlock Text="{Binding WholeAddress}" FontSize="{Binding FontSize}" Foreground="{Binding Foreground}" Margin="{Binding MarginSize}" HorizontalAlignment="Left" TextWrapping="Wrap" />
                      </Grid>                
                    
                </DataTemplate>
              </ListBox.Resources>
            </ListBox>

public class TrackedOrderViewModel : ViewModelBaseUnity
{
        private Address OrderAddressTo
        {
            get { return _addressTo; }
            set
            {
                _addressTo = value;
                City = _addressTo.City;
                Street = _addressTo.Street;
                NotifyPropertyChanged("WholeAddress");
            }
        }

        public TrackedOrder Order
        {
            get { return _order; }
            set
            {
                _order = value;
                _order.AddressTo.OnLoadedAction = o =>
                {
                    OrderAddressTo = o as Address;
                };
            }
        }

        public string WholeAddress
        {
            get
            {
                return string.Format("{0}. {1}", City, Street); 
            }
        }

}