No my problem not about that. In vfp9 visible really enough for hide column. I think about there is a bug. Columns mixed when using vertical splitbar...:

I'll draw:


think it a grid:

Name Surname City Address .......


I'm using horizontal splitbar for move left-right, then grid become:


Name Name Name Surname City Address .......


If I use keyboard for move it doesn't occurs. If I press each name header, my grid will recorrected.