To reproduce:
- Bind the grid to progress binding source at design time. 
- Locate GroupDescriptors in Properties and click the ellipsis button to open the GroupDescriptor Collection Editor.
- Click Add and select the new item.
- Select the GroupNames collection to open the SortDescriptor Collection Editor.
- Click Add.
- An exception is thrown and the UI freezes.

Workaround:
Add descriptors at runime.