>>It seems to me, yes. Here is the simple test, I just made. I ran the form, made couple of changes and then moved scroll button to the upper position. Now I'm trying to move this button, but it resists. Once I revert/or TableUpdate, I'm able to move this button again. I showed my code in answer to Marcia, though I don't see, how code in AfterRowColChange may influence on scroll event...
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>I'd say you've got a filter issue. Filters cause the effect you see with the scroll button not relocating to the top of the grid.

For this particular regim, there were no filters set. However, for other regimes I need filter. Anyway, the problem exists without any filter, so it's not a filter problem.
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>I'm with Marsha and Cetin. A grid, especially, is no place for row buffering. I think you'd be solving a symptom (maybe, but adding other headaches) and not the cause of your problem. I suggest you simplify your situation and get it working...grid with table buffering, no SET KEY, no filters, comment out grid-related methods, and then start adding pieces back in til you find the bit that's messing you up.

I'll try. I have some custom code in grid double click and grid right click event...