>>AfterRowColumnChange fired only when the grid have the focus.
>>
>>Check if the current active control lost the focus when the active page is changed,
>>I guess it doesn't.
>>
>>The second click on the grid force the lostfocus.
>>
>>This is a known Pageframe's bug.
>>
>>Check if the VFP application code set the ActivePage = .., use Page.SetFocus ( but Setfocus have another bug )
>>I doesn't remember exactly.
>
>
>I manually did a Grid.SetFocus() in the page's activate method and that seems to solve the problem. I agree that this is obviously a bug. I don't see how it couldn't be. When the record pointer moves in the grid, and the highlighting moves with it, yet the Before/AfterRowColumnChange methods don't fire .. it's a bug!!

Probably, your code used Grid.Refresh in some place. In previous VFP versions Setfocus was always 'required' to use instead of Refresh. Now in VFP9 it seems that most cases got fixed, but maybe some are still around.