private void bAddFilter_Click(object sender, RoutedEventArgs e)
        {
            SourceWindow swindow = new SourceWindow(client);

            if (swindow.ShowDialog() == true)
            {
                Filter  = swindow.Filter;
                Devices = swindow.SelectedDevices;
            }
        }
        private void cbNet_Checked(object sender, RoutedEventArgs e)
        {
            bAddFilter.IsEnabled = true;
            SourceWindow swindow = new SourceWindow(client);

            if (swindow.ShowDialog() == true)
            {
                Filter  = swindow.Filter;
                Devices = swindow.SelectedDevices;
            }
        }