Hi Ljuban,
We are unclear of your requirement to track the edited cells. So, please share the details that you are trying to implement by retrieving the edited cells with image illustration. Moreover, the reported InvalidOperationException might be occurred due to your code customization with GridCell. So, please share the code part that you tried at your end. So that, we could analyze further and provide proper solution to achieve your requirement.
Regards,
Arulpriya Ramalingam