protected override void OnInitialize()
{
base.OnInitialize();
Rejects = Begin.Concat(End)
.Do(_ => IsLoading.Value = true)
.Select(_ => RxQuery(s => {
var begin = Begin.Value;
var end = End.Value.AddDays(1);
var result = s.Query <Reject>()
.Where(r => r.LetterDate >= begin && r.LetterDate < end)
.OrderBy(r => r.LetterDate)
.ToList();
return(result);
}))
.Switch()
.Do(_ => IsLoading.Value = false)
.ToValue(CloseCancellation);
}