SortDescriptor error in Expression Blend 3

[Gilad Globen]

I have a RadGridView bound to a generic ObservableCollection of a class I use in my application.
The class has a public property called ID (int)

I created a sort descriptor to make sure the data is sorted using the ID field
Code:
<Telerik:RadGridView.SortDescriptors>
      <Telerik_Windows_Data:SortDescriptor  Member="ID" SortDirection="Descending"/>          
</Telerik:RadGridView.SortDescriptors>

While working at run-time the code generates an Expression Blend 3 error:
"Invalid property or field - 'ID' for type Object"

I'd appreciate any input on why.

[Milan]

Hello Gilad Globen,

We are aware of this issue and we will fix it as soon as possible. Most probably you are binding the grid using a DataContext similarly to this:

<Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource SampleDataSource}}">
        <telerik:RadGridView Margin="76,20,84,92" ItemsSource="{Binding Collection}">
            <telerik:RadGridView.SortDescriptors>
                <telerik:SortDescriptor Member="Property1"/>
            </telerik:RadGridView.SortDescriptors>
        </telerik:RadGridView>
    </Grid>

If you modify the ItemsSource binding to bind directly to the collection the problem should be eliminated.

ItemsSource="{Binding Collection, Source={StaticResource SampleDataSource}}"

Hope this helps.

Best wishes,
Milan
the Telerik team

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[Nils]

Milan,
can you tell what is the status on this ?
I have the same problem using VS2008, RadControls for wpf version 2009.3.1314.35
and binding the ItemsSource using a navigatable property:

<telerik:RadGridView ItemsSource="{Binding Path=Foo.Bar}">
  <telerik:RadGridView.SortDescriptors>
    <telerik:SortDescriptor Member="BarProp1"/>
  </telerik:RadGridView.SortDescriptors>
</telerik:RadGridView>

Nils

[Nils]

Gilad and others who have this Problem:
Seems there are currently 3 ways to get this resolved:
1. The one Milan described above
2. Setting the SordDescriptor from code, not in xaml (right after InitializeComponents())
3. Setting the SortDescriptor in xaml without setting the Member-Property (my preferred way)

In third case make sure the Objects in ItemsSource implement IComparable !

Nils