private void OpenDisplayOption() { try { Option oOption = System.Windows.Application.Current.Windows.OfType <Option>().FirstOrDefault(); if (oOption != null) { oOption.Show(); oOption.Focus(); } else { oOption = new Option(); oOption.Owner = Application.Current.MainWindow; oOption.Activate(); oOption.Show(); } } catch (Exception ex) { ExceptionUtility.LogError(ex); } }