Hi Arul,
Maybe this helps you. It is kinda clumsy but might work for you.
Sounds like you are ending up on the right page but in the wrong spot on that page. Yah?
So at the end of your button code (which already works) just put in:
xfa.host.pageDown();
xfa.host.pageUp();
So, in effect, you are going off page and then immediately coming back. It happens very quickly, so the user won't notice it.
It has the result of bringing you to the TOP of the page.
Good Luck,
Joe