The main point here is that GridViewToggleRowDetailsColumn does not inherit from GridViewBoundColumnBase, so that it has no exposed DataMemberBinding property. I would advise yout to design a custom column that mimics the GridViewToggleRowDetailsColumn's features and inherits from GridViewBoundColumnBase. I have prepared an example project that illustrates this approach. Please, refer to it and do not hesitate to contact us immediately if any further inquiries occur.
the Telerik team
Do you want to have your say when we set our development plans? Do you want to know when a feature you care about is added or when a bug fixed? Explore the Telerik Public Issue Tracking
system and vote to affect the priority of the items