One quick note that caused me trouble.

Make sure that this.Data is initialized.  Even as an empty NSObject array or the headers still will not be rendered.

Ah, sorry, i misread. 

Thats tricky since if you have no rows, then you technically have no sections. 

What you could do is check if your array has zero items and tell the dsh that there is one row and then when it asks for that cell, you would just return null.

Something like this:

public class GridDSH : IGGridViewDataSourceHelper
    {
        public override int NumberOfRowsInSection (IGGridView gridView, int section)
        {
            int count = this.Data.Length;
            if (count == 0)
                return 1;

            return count;
        }

        public override IGGridViewCell CreateCell (IGGridView gridView, IGCellPath path)
        {
            if (this.Data.Length == 0)
                return null;

            IGCellPath normPath = this.NormalizePath (path);

            IGGridViewColumnDefinition colDef = (IGGridViewColumnDefinition)this.Columns [normPath.ColumnIndex];
            if(colDef != null)
            {
                IGGridViewCell cell = colDef.CreateCell (gridView, path, this);
                return cell;
            }

            return null;
        }
    }

-SteveZ

Hey Stephen - So in your sample its returning a results set of 200 items. If you change the line that states:

dsh.Data = IGSalesmanItem.GenerateData (200).ToArray ();

to

dsh.Data = IGSalesmanItem.GenerateData (0).ToArray ();

You will then see that the red section header view does not appear.

Any thoughts on how to still get it to appear when data items in the array are = 0?