I am using the following code to populate a wpf datagrid with items in my db4o OODB:

IObjectContainer db = Db4oEmbedded.OpenFile(Db4oEmbedded.NewConfiguration(), "C:\Dev\ContractKeeper\Database\ContractKeeper.yap");

var contractTypes = db.Query(typeof(ContractType));

this.dataGrid1.ItemsSource = contractTypes.ToList();

Here is the XAML:

<Window x:Class="ContractKeeper.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:dg="http://schemas.microsoft.com/wpf/2008/toolkit"
    Title="Window1" Height="300" Width="300">
    <Grid>
        <dg:DataGrid AutoGenerateColumns="True" Margin="12,102,12,24" Name="dataGrid1" />
    </Grid>   
</Window>

When the items get bound to the datagrid, the gridlines appear like there are records but no data is displayed. Has anyone had this issue with db4o and the wpf datagrid?