Easiest approach to use Ajax Tookit Tab Containers and Tab Panels, Put GridView in the content template of TabPanel.
<ajaxToolkit:TabContainer runat="server"
OnClientActiveTabChanged="ClientFunction"
Height="150px">
<ajaxToolkit:TabPanel runat="server"
HeaderText="Signature and Bio"
<ContentTemplate>
-- Grid View --
</ContentTemplate>
/>
</ajaxToolkit:TabContainer>