private static (IModelColumn modelColumn, IModelPositionInListViewListViewItem item) PositionMember(this ListView listView)
{
var item = listView.Application().Model.ModelPositionInListView()
.ListViewItems.First(rule => rule.ListView.Id() == listView.Id);
var modelColumn = listView.Model.Columns.FirstOrDefault(column => column.ModelMember == item.PositionMember);
if (modelColumn == null)
{
modelColumn = listView.Model.Columns.AddNode <IModelColumn>();
modelColumn.PropertyName = item.PositionMember.Name;
modelColumn.Index = -1;
}
return(modelColumn, item);
}