GridView: how to make visible grid header while scrolling up ?..

Hi,

I have putted my Gridview inside the DIV

<div style="font-size: 8pt; width: 530px; font-family: Arial, Tahoma, Verdana; height: 245px; overflow:auto;"> MyGeidView is here </div>

now I want to show my Gridview header while scrolling up.
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