OK, I have some problem

I must associate ItemsSource with object of type IEnumerable (not generic) since I don't know the type of object at run-time

First I dynamically create columns of type TextColumn with specific keys

Then, since I couldn't bind to IEnumerable, I am setting it in code behind like this:

grid.ItemsSource = DataCollection;

- this works, grid populated fine

However, afterwards the application needs to change both columns and itemssource

1. I set ItemsSource to null

2. Delete all previous columns

3. Try to create new columns - exception here with this stacktrace

   at Infragistics.Controls.Grids.XamGridRowsManager.InvalidateGroupBy(Boolean reset)
   at Infragistics.Controls.Grids.RowsManager.InvalidateData()
   at Infragistics.Controls.Grids.RowsManagerBase.OnColumnLayoutPropertyChanged(ColumnLayout layout, String propertyName)
   at Infragistics.Controls.Grids.RowsManager.OnColumnLayoutPropertyChanged(ColumnLayout layout, String propertyName)
   at Infragistics.Controls.Grids.XamGridRowsManager.OnColumnLayoutPropertyChanged(ColumnLayout layout, String propertyName)
   at Infragistics.Controls.Grids.RowsManagerBase.OnColumnLayoutPropertyChanged(Object sender, PropertyChangedEventArgs e)
   at Infragistics.DependencyObjectNotifier.OnPropertyChanged(String propertyName)
   at Infragistics.Controls.Grids.ColumnLayout.InvalidateData()
   at Infragistics.Controls.Grids.ColumnLayout.OnColumnAdded(ColumnBase columnBase)
   at Infragistics.Controls.Grids.ColumnBaseCollection.AddItem(Int32 index, ColumnBase item)
   at Infragistics.Collections.CollectionBase`1.Add(T item)

I am having doubts if this manual set of ItemsSource is remembering only the first actual assignment of data;

Please give me any hint