TAdvColumnGrid error on Tab

I am using a TAdvColumnGrid, and the rightmost column is set to a width of zero, always (my choice). When I am in the last visible column, and hit Tab, I get a list out of bounds error. I have not found any property which would clear this.

We have retested this with our latest version
but we could not see such problem here.
Could you please provide some sample source project with which we can reproduce this here ?