ICustomTypeDescriptor defect

[Vladimir]

Hello! 

Symptoms: RadDataForm don not see custom properties of object which implements ICustomTypeDescriptor when RadDataForm.CurrentItem set and RadDataForm.ItemsSource is null.

Location ItemPropertyInfoHelper.cs(Telerik.Windows.Data.dll assembly Telerik.Windows.Data namespace):

private static PropertyDescriptorCollection GetPropertyDescriptors(QueryableCollectionView collectionView)
{
...
if (TypeExtensions.IsCompatibleWith(elementType, typeof (ICustomTypeDescriptor))) //code pass
        return ItemPropertyInfoHelper.GetPropertyDescriptorsForCustomTypeDescriptorElementType(collectionView);
...
}

public static PropertyDescriptorCollection GetPropertyDescriptorsForCustomTypeDescriptorElementType(QueryableCollectionView collectionView)
    {
      var customTypeDescriptor = ItemPropertyInfoHelper.GetCollectionViewRepresentativeItem(collectionView) as ICustomTypeDescriptor; //returns null
      if (customTypeDescriptor != null) return customTypeDescriptor.GetProperties(); //Never called when ItemsSource is not set
      else return null;
    }

private static object GetCollectionViewRepresentativeItem(QueryableCollectionView collectionView)
    {
      if (!collectionView.IsEmpty) return collectionView.GetItemAt(0); //collection is empty
      else return null;
    }

Can you confirm this behavior?
Telerik version 2013.3.1016.40

[Maya]

Hello Vladimir,

Indeed, you are right. I have logged the issue in our Portal so that you can follow its progress. 
Thank you for reporting this, I updated your Telerik points accordingly. 

Regards,
Maya
Telerik