How to style an ajax calendar inside a gridview [Resolved]

When the calendar pops up, it appears behind the textbox of the successive row,and so hiding a few dates. How can I fix this.

<asp:gridview>
  <asp:Templatefield>
    <itemtemplate>
      <div style="position:relative">
        <asp:textbox id="txtDate"/>
        <asp:calendarextender   popupposition="bottomright" Targetcontrolid="txtDate"/>
      </div>
    </itemtemplate>
  </asp:Templatefield>
</asp:gridview>

[Resolved]