I am using ultra web grid

Just stuck in a simple issue i belive.

I am adding data rows to the grid on the button click.

I have my grid inside on of the tables rows as:

<table width="100%">
    <tr>
        <td style="width:28%">

              <igtbl:UltraWebGrid................ my grid

             </igtbl:UltraWebGrid>                 
        </td></tr>

Now my problems is the UI shows  10 rows on the grid and after that when I click button again it keeps on adding the rows but overlaps my table aboveor anything else that is above and I can't even scroll though the data.

Pls sugges