private void UpdateClusterBoxInternal(int ping, ClusterInfo info)
        {
            try
            {
                if (info == null)
                    clusterInfoGrid.SelectedObject = new object();
                else if (!info.Equals(clusterInfoGrid.SelectedObject))
                    clusterInfoGrid.SelectedObject = info;
            }
            catch(NullReferenceException)
            {
                // komische PropertyGrid Exception ignorieren
            }

            clusterBox.Text = ClusterControl.FormatClusterText(CurrentCluster);

            ClusterControl.SetClusterBoxColor(clusterBox, ping, info);
        }