I am using an UltraWebGrid with AJAX activated to enable partial-rendering. I have RowsRange=50 and a TemplatedColumn containing a checkbox control on each row.
Finally I have a Submit button outside the grid. Clicking this button initiates an onClick event that traverses the grid row collection and processes each row where the checkbox control is checked.

This works fine for the first 50 rows in the grid. If I do scroll past the first 50, the grid control works as expected and brings in the next 50 rows of the grid. However if I check any of the rows past the first 50 and hit Submit, none of them are processed.
Stepping thru the loop tells me that the UltraWebGrid1.Rows always returns the value 50 even though I have scrolled past the first 50 and caused the grid to bring in additional rows.

I am attaching an example that will enable you to duplicate this problem. I would appreciate knowing what I am doing wrong and how I can get this to work as needed.
Had a similar problem earlier (ref.CAS-38537-LXX8W7) when I was using Vol 7 of your library. Have upgraded to Vol. 10 since.