Developing custom widget without scrolled window

[niwedita burnwal <navy035 gmail com>]

Hi,
I am creating a custom widget for Log viewing in which I have added one 
table (with no of columns). The table is to have so many entries such 
that it will exceed the screen size. But to view the entries which are 
not visible in the screen we dont have to use scrolled window, instead 
we have to use two buttons, one at the top and another at the bottom. 
And we have to implement the functionality so that on click of top 
button the entries will move up and on click of bottom button viceversa.
 Although with adjustment I am able to do this but I need a particular 
size of the table to be visible on the screen.. which I am not able to 
set. Could anyone help?

Thanks,
navy035