I cannot see a problem, event with OnGetEditorType.
See this sample project that works as expected here:
Project1.zip (52.9 KB)
I did some more tracking of the problem by setting a lot of breakpoints. The grid performs as it should until I resize the form and it has to redraw. It is part of a very large program. I will try to see if I can make the problem happen in some sample code. I am also using the inspectorbar for the user to select which table will be displayed. I don't think that should interact but it does get repainted when the window is resized.
Please isolate this and provide a sample source app with which this can be reproduced if the issue is really in the component code.