is there a way to determine if scrolling is in progress?

I have to clear the selected cell when a user tabs or clicks out of the grid and set the selected cell when the user tabs or clicks into the grid. The problem is that I use onControlActivated and onControlDeactivated events which also get invoked when the scrollbar is clicked.

I have a very ugly solution which involves testing of the event src class name and time elapsed. If I can test for is scrolling then I have a much cleaner solution.

Many thanks.