Here's a followup on what I've discovered...
I actually have several grids, each placed on different tabs in a tab control. The tab control is inside a panel.
If I set the panel.enabled = false, bind the data, and then set the panel.enabled = true, I get the strange scroll bar behavior. What's even stranger is that not all the grids are afflicted with the problem.
If I set the panel.enabled = true before I bind the data all appears well.
Just thought I'd pass that on.......