private async void BtnFind_Click(object sender, RoutedEventArgs e)
{
TextToFind = TxtTextToFind.Text;
if (string.IsNullOrEmpty(TextToFind) == false)
{
PgbProgress.Visibility = Visibility.Visible;
CancellationTokenSource = new CancellationTokenSource();
Running = true;
BtnFind.IsEnabled = false;
await TextControl.FindText(TextToFind, ProgressStatus, CancellationTokenSource.Token);
Running = false;
BtnFind.IsEnabled = true;
PgbProgress.Visibility = Visibility.Hidden;
}
}