Hi,

I'm getting a null reference exception when trying to expand hierarchical data after moving a column on a xamDataGrid.  

I am calling "xamHierarchyGrid.FieldLayouts[0].Fields.Move(startIndex, moveToIndex);" to move the column.  This seems to work correctly, and the column updates and moves to the new position.  However, if I try to expand the hierarchial data by clicking on the plus icon to view the subrecords after calling this a couple of times, the program crashes with the null reference exception. 

I can expand and hide the data just fine before I move the column.  After moving the column once, sometimes it will crash when I try to expand the data, sometimes it will work, and occasionally, it will expand but no data will show up.  After moving the column 2-3 times, it will almost always crash when I attempt to expand the data.

This is the code I am calling to move the column:

int startIndex = xamSettingHierarchyGrid.FieldLayouts[0].Fields[fieldname].Index;

if (startIndex != moveToIndex)

{

    xamSettingHierarchyGrid.FieldLayouts[0].Fields.Move(startIndex, moveToIndex); 

}

This is the exception I get:

System.NullReferenceException was unhandled
  Message="Object reference not set to an instance of an object."
  Source="Infragistics3.Wpf.DataPresenter.v8.1"
  StackTrace:
       at Infragistics.Windows.DataPresenter.FieldLayout.a.a()
       at Infragistics.Windows.DataPresenter.FieldLayout.a.b()
       at Infragistics.Windows.DataPresenter.FieldLayout.a.a(Field A_0)
       at Infragistics.Windows.DataPresenter.ExpandableFieldRecord.get_Description()
       at Infragistics.Windows.DataPresenter.RecordPresenter.GetRecordDescription()... etc.

   

Any help would be greatly appreciated, thanks.