public MainWindow()
{
InitializeComponent();
((Storyboard)Resources["krecisiekolo"]).Begin();
((Storyboard)Resources["krecisiekolo"]).Pause();
tokenSource = new CancellationTokenSource();
convertersCombobox.ItemsSource = new ConvertersService().GetConverter();
FilterByConverterName.ItemsSource = convertersCombobox.ItemsSource;
this.Loaded += MainWindow_Loaded;
//pobierz z bazy ocene aplikacji
rateMe.Value = LogDBU.GetRateMeValue();
RelayCommand convertCommand = new RelayCommand(obj => Convert(), obj =>
convertersCombobox.SelectedItem != null && UnitToCombobox.SelectedItem != null && UnitFromCombobox.SelectedItem != null && string.IsNullOrEmpty(inputTextbox.Text) == false);
convertButton.Command = convertCommand;
}