Errors on MapShapeReader.Source after upgrade

[LaDonna]

After upgrading to the latest version, we can no longer build our map Silverlight code.
This is the original code:
Uri worldUri = new Uri(string.Format(ShapeRelativeUriFormat, "world"), UriKind.Absolute); 
this.worldLayer.Reader = new MapShapeReader(); 
this.worldLayer.Reader.Source = worldUri;

We are receiving errors on :
'Telerik.Windows.Controls.Map.MapShapeReaderBase' does not contain a definition for 'Source' and no extension method 'Source' accepting a first argument of type 'Telerik.Windows.Controls.Map.MapShapeReaderBase' could be found (are you missing a using directive or an assembly reference?)

I tried modifying the code to accept the worldUri as a parameter in the new MapShapeReader instantiation call.  That doesn't give a compile error, but it doesn't work either!

Help!!!!!!!!!

[LaDonna]

With help from support,

The type of InformationLayer.Reader property is MapShapeReaderBase. However currently it does not contain the Source property. So, you should cast the value of the Reader to the MapShapeReader before assigning the Source property like this:

((MapShapeReader)this.worldLayer.Reader).Source = worldUri;

This fixed it!

[PARAG]

Map is not visible after integrating MapShapeReader.

[Andrey]

Hello LaDonna,

The type of InformationLayer.Reader property is MapShapeReaderBase. But currently it does not contain the Source property. So, you should cast the value of the Reader to the MapShapeReader before assigning the Source property like this:

((MapShapeReader)this.worldLayer.Reader).Source = worldUri;

Regards,
Andrey Murzov
the Telerik team