I've got a serious problem with grid's vertical scroll bar when I load data into the grid frequently and specially when the loaded data has a size of zero. It comes from that the user can set some time periods to get the time series data between the period, and when the set period has no data I load an empty store into the grid, so when the user change the period to a one that has some data, the scroll bar stops working as dragging it up and down has no effect on the grid's view. The ridicules point is that it doesn't happen all the time with this scenario but most of the time. I searched community and tried everything that has mentioned about the grid's scroll bar problems but no one worked.
I use the grid in a panel and it's layout is fit and autoScroll is enabled.