Gridview Headers did not show proper

hi
i am design my grid like this

<table cellpadding="0" cellspacing="0" class="tab_prob" onmouseover="return clearlabel();">
<tr>
<td>
<div style ="width: 750px; overflow: auto; height: 160px">
<asp:GridView Width="100%" PagerSettings-Visible="true">
</asp:GridView>
</div>
</td>
</tr>
</table>

but when i will using scroll bar my gridview header did not show how to
set default show the header for refer below this image

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