/// <summary>
/// The user is closing the form; save application settings.
/// </summary>
/// <param name="sender">Unused.</param>
/// <param name="e">Unused.</param>
private void ClusterBrowser_FormClosing(object sender, FormClosingEventArgs e)
{
this.refreshTimer.Stop();
this.queue.Stop();
this.formSettings.Location = this.Location;
this.formSettings.Size = this.Size;
this.formSettings.MaximizeWindow = this.WindowState == FormWindowState.Maximized;
this.formSettings.AutoRefresh = this.autoRefreshToolStripMenuItem.Checked;
this.formSettings.KnownClusters = ClusterConfiguration.KnownClustersSerialization();
this.formSettings.Save();
}