Progress supplies both OpenEdge ABL and Telerik Winforms controls.
Historically all sample code is in C#. Some controls behave different when linked to a Probindingsource instead of a .Net bindingsources.
It would be a great help is Progress would create ABL.Net sample code for the Telerik controls.
It would also offer Progress a change to proactively fix issues that occur when Telerik components are used in an OpenEdge context.