Selected rows in module pool table control getting unselected while scrolling

Hi,

I am having a problem with my module pool program. I have a table in my module pool program. I have not created it by wizard and at this point of time I can't do that also. I have the table like below.

I now if the table has more records then we have a scroll button. In this case I have selected 2nd row and now if I scroll down to select another button this 2nd row, which is already selected is getting unselected.

How can I make this selected when scroll also.

Thanks & Regards,

Supratik