Gergana,

I have a IEnumerable<DataType> where the DataType has upto 20 properties. The IEnumerable has between 10 to 1000 items. I'm grouping the data by upto 4 properties of the DataType. This is fine when there is 1000+ items, all the groups make sense. However when there are only 10 items, 2 of the groups are not required. So I would like to examine the groupings and if the group only contains one group, then remove, turn off or set a setting that stops XamDataGrid to not allow groups with only one group.

 Sorry just realised that I pasted the wrong code snippet in my original post.

I'm doing it just before I'm doing the summaries with this:

if (attributes.Any(attribute => attribute.GroupBy))
{
    if (!XamDataGrid.Resources.Contains("ColourKey"))
    {
        var datatype = typeof (GroupByRecordPresenter);
        var style = new Style(datatype);
        style.Resources.Add(new ComponentResourceKey(typeof (XamDataGrid), "LabelHighlight"), new SolidColorBrush(Colors.Transparent));
        style.Resources.Add(new ComponentResourceKey(typeof (XamDataGrid), "LabelBackground"), new SolidColorBrush(Colors.Transparent));
       
        foreach (var source in attributes.Where(attribute => attribute.GroupBy).OrderBy(attribute => attribute.Order))
        {
            var brush = new LinearGradientBrush() { Opacity = 0.5, StartPoint = new Point(0.5,0), EndPoint = new Point(0.5,1)};
            brush.GradientStops.Add(new GradientStop(Colors.Snow, 0));
            if (source.ColourBinding)
            {
                var stop = new GradientStop(source.ColourCodeFinish, 0.9);
                var binding = new Binding("ChildRecords[0].DataItem." +
                        attributes.FirstOrDefault(attribute => attribute.ColourBound).PropertyName);
                BindingOperations.SetBinding(stop, GradientStop.ColorProperty, binding);
                brush.GradientStops.Add(stop);
            }
            else
            {
                brush.GradientStops.Add(new GradientStop(source.ColourCodeStart, 0.1));
                brush.GradientStops.Add(new GradientStop(source.ColourCodeFinish, 0.9));
            }
            e.FieldLayout.SortedFields.Add(new FieldSortDescription(source.PropertyName,
                ListSortDirection.Ascending, true));
          
            brush.GradientStops.Add(new GradientStop(Colors.Snow, 1));
            var trigger = new DataTrigger() {Value = source.PropertyName};
            trigger.Binding = new Binding("GroupByField.Name") { BindsDirectlyToSource = true };
            trigger.Setters.Add(new Setter(BackgroundProperty, brush));
            style.Triggers.Add(trigger);

        }
        XamDataGrid.Resources.Add("ColourKey", style);
    }
   
    var statbinding = new Binding()
    {
        Source = XamDataGrid.Resources["ColourKey"],
        BindsDirectlyToSource = true
    };
    BindingOperations.SetBinding(XamDataGrid.FieldSettings, FieldSettings.GroupByRecordPresenterStyleProperty, statbinding);
}