Thanks, I now have more info.

I have a grid in which the user can insert lines by pressing Enter in the last column of the last line. In some cases, a line generates other lines that I make appear automatically, next to the first one, and are related to it but they are not enabled for the user to modify them.

When the user starts a new line, he has the option of using ESC to erase it and the focus should go the previous line. I have noted that when the previous line is one of these special ones that are not enabled, the Grid does not receive the focus but only when it is clicked... I think a line that is not enabled should receive the focus (even if it doesn't go in edit mode)...

Thanks again