Get grouped row position

[anuri73]

I want to get grouped row position in GroupGridView. But i don't know how to do it. I tried to create mysql view:
SELECT
...
(SELECT COUNT(0) FROM SPD.Task WHERE (SPD.Task.id <= t.id)) AS pos,
...
But when i use it with search criteria it gives wrong position(Number of the row is equal like if don't use condition).
Does anyone else faced against this task?