private void InitDoc(ReturnDoc doc)
{
Doc = doc;
var docStatus = Doc.ObservableForProperty(x => x.Status, skipInitial: false);
var editOrDelete = docStatus
.CombineLatest(CurrentLine, (x, y) => y != null && x.Value == DocStatus.NotPosted);
editOrDelete.Subscribe(CanEditLine);
editOrDelete.Subscribe(CanDelete);
docStatus.Subscribe(x => CanAdd.Value = x.Value == DocStatus.NotPosted);
docStatus.Select(x => x.Value == DocStatus.NotPosted).Subscribe(CanPost);
docStatus.Select(x => x.Value == DocStatus.Posted).Subscribe(CanUnPost);
}
