silverlight 4 datagrid does not show all rows

[f]

My list collection is populated with rows. Each row has fields...
The datagrid only shows the first row in the list.
Note that the datagrid.itemsSource does have the rows but only the first row is shown in the datagrid.

Do you knoiw why please?

gridMain.ItemsSource = results;

Thanks

[Alan Fisher]

I also have the same problem. Did you manage to resolve it?