Hi TMS Support team,
You should never call functions that force the focus away from the grid from the OnCellValidate event. Taking the focus from the grid affects the process of stopping editing (it also causes that editing stops).
I will need details / full grid settings , preferably a sample source project with which this can be reproduced with the latest version 188.8.131.52 of TDBAdvGrid
I send you a sample source project
It is on our todolist to investigate
Thank you very much Bruno