scrollToRow doesn't work if the target row is in the visible zone

smart GWT Pro 4.1 20150227

we are currently developing some page emulator and using this api to scroll target row as first one:

scrollToRow(targetRow, VerticalAlignment.TOP);


it works in the case that if the target row is not in visible zone :

row 6
---------------------------
row 7
row 8

...... visible zone

row 20
row 21
----------------------------
row 22


if we scroll to 6 or 22, then it works.

however, if we scroll to row 7 - 21, then nothing happened...

in our case, we need scroll target row to first one even if it is already in visible zone.


is there any possible to do it ?

thanks!