Possible to get index of rows in viewable grid window?

Hi - I am new to activewidgets but am already loving all that it can do. I am using it with AJAX to load data.

Question is this: Is it possible to get the index of the first row that is displayed in the grid at any given time when as the user scrolls. Was trying to do calculations by how far the user scrolled but would rather know what record they are currently looking at.

Any help would be much appreciated - thanks in advance :)