private async void buttonRefreshButton_Click(object sender, TextChangedEventArgs e)
 {
     vm             = new ViewModels.DodawaniePiwaViewModel();
     BindingContext = vm;
     InitializeComponent();
 }
 public OknoDodawaniaPiwa()
 {
     vm             = new ViewModels.DodawaniePiwaViewModel();
     BindingContext = vm;
     InitializeComponent();
 }