Thank you for your patience.
We have analyzed your reported issue “Application hang/freeze-up scenario when a Detail cell is clicked”. This issue occurs only when showing MessageBox in CellClick event of DetailViewDataGrid and works fine for parent grid. In default, when an MessageBox is shown, we can’t perform any UI action before closing the MessageBox. It seems that application hangs up due to MessageBox is shown and hidden immediately in DetailsView case, so we could not close the MessageBox to proceed further on UI. Currently, we are checking this scenario, we need one more business day to validate this issue. We will provide complete details on December 19, 2019.
We appreciate your patience until then.