private void BtnLoadProtocols_OnClick(object sender, RoutedEventArgs e) { var protocolController = ProtocolController.LoadProtocols(); if (protocolController == null) { return; } ProtocolController = protocolController; CbProtocols.ItemsSource = ProtocolController.Protocols; if (CbProtocols.Items.Count > 0) { CbProtocols.SelectedIndex = 0; } BtnSaveProtocols.ToolTip = string.Format(@"Save {0}", ProtocolController.FileName); }