public IProgressUi Create(int maxValue)
{
var window = new ProgressWindow();
var viewModel = new ProgressViewModel();
window.DataContext = viewModel;
window.Icon = BitmapFrame.Create(new Uri("pack://application:,,,/CalDavSynchronizer;component/Resources/ApplicationIcon.ico"));
viewModel.SetMaximun(maxValue);
window.ShowActivated = false;
window.Show();
return(viewModel);
}