Problem with table default selected Row

First row is the default selected row in table. Is it possible to change this? when ever i am doing row level action(some update or delete) it is not effecting the current row. If I want to update the third row it is updating first row because the defalut row is first one.For this I have to select the row first and then I have to perform row level action.
I want like this. whenever I am clicking the button in perticular row it has to effect that perticular row only without selcting row before.

Problem solved with triggeredrow and table defaultvalue to -1.