What is the best way to do this in code?  I have tried the following:

private void AllergyGrid_InitializeRow(object sender, Infragistics.Controls.Grids.InitializeRowEventArgs e)
        {
            if (e.Row != null)
            {
                if (e.Row.RowType == Infragistics.Controls.Grids.RowType.GroupByRow)
                {
                    e.Row.IsExpanded = true;
                }
            }
        }
 
        private void AllergyGrid_Loaded(object sender, RoutedEventArgs e)
        {
            foreach (Infragistics.Controls.Grids.Row row in ((Infragistics.Controls.Grids.XamGrid)sender).Rows)
            {
                if (row.RowType == Infragistics.Controls.Grids.RowType.GroupByRow)
                {
                    row.IsExpanded = true;
                }
            }
        }

Neither is working.

I'm sorry, i should have provided that code before:

You can use the GroupByCollectionChanged event:

Something like: 

private void grid_GroupByCollectionChanged(object sender, GroupByCollectionChangedEventArgs e)

        {

            if (e.NewGroupedColumns != null && e.NewGroupedColumns.Count > 0)

            {

                foreach (Row r in grid.Rows)

                {

                    r.IsExpanded = true;

                }

            }

        }

Hope this helps,

-SteveZ 

Thanks, that was the next event I was trying.

Still seems to be a problem.  The event gets fired before the data is loaded asynchronously.  So there are no rows when the event is fired.

private void AllergyGrid_GroupByCollectionChanged(object sender, Infragistics.Controls.Grids.GroupByCollectionChangedEventArgs e)
        {
            if (e.NewGroupedColumns != null && e.NewGroupedColumns.Count > 0)
            {
                foreach (Infragistics.Controls.Grids.Row r in ((Infragistics.Controls.Grids.XamGrid)sender).Rows)
                {
                    r.IsExpanded = true;
                }
            }
 
            
        }

Hi Yoann, 

We haven't added any additional functionality for this yet, so for now your best option is to follow the approach that dkrecker suggested.

-SteveZ

Hi,

Someone can help me please?

Hi,

I have the same problem, how can I solve it please?

Regards,

Yoann

Hi dkrecker,

I have logged a Feature Request for this functionality, with an ID number of FR12799.  I will follow up with you in a private support case.

Thanks,

I ended up just creating my own event.  I raise it when data has finished loading from my viewmodel and handle it in my view. 

Doing something as simple as defaulting my groups to expanded should not require this.