protected async void Cancel()
 {
     await TaskHasChanged.InvokeAsync(true);
 }
        //protected override async System.Threading.Tasks.Task OnInitializedAsync()
        //{
        //}

        //// wenn Parameter gesetzt wird
        //protected async override void OnParametersSet()
        //{
        //}

        protected async void Save()
        {
            await proxy.ChangeTaskAsync(this.Task, am.Token);

            await TaskHasChanged.InvokeAsync(false);
        }