Hi John,
Yes, if you turn off the summary area, then just set this and you should get descriptions in the tooltips for the name cells:
<grids:PropertyGrid DataObject="{Binding}" CanClearDataObjectOnUnload="True">
<grids:PropertyGrid.DefaultStringNameTemplate>
<DataTemplate>
<Grid Background="Transparent" ToolTip="{Binding Description}">
<shared:AdvancedTextBlock x:Name="textBlock" Margin="5,3,1,3" Text="{Binding DisplayName}"
TextTrimming="CharacterEllipsis" VerticalAlignment="Center" />
</Grid>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsReadOnly}" Value="True">
<Setter TargetName="textBlock" Property="Opacity" Value="0.7" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</grids:PropertyGrid.DefaultStringNameTemplate>
</grids:PropertyGrid>
It's basically the default "DefaultStringNameTemplate" value, except a Grid was added with a ToolTip set.