private async void OnInsertRegister(object sender, RoutedEventArgs e)
        {
            var dialog = new InsertRegister();
            await dialog.ShowAsync();

            var reg = dialog.RegisterName;

            if (reg != null)
            {
                var struc = new CalcCommand($"f:$r{reg}", reg.ToLower());
                CalcCommandGlobalEvent.Emit(struc);
            }
        }