Dear Kishore,
You want to show both gridview together (without making invisible another gridivew) as I understood your question. For these you don't need to use tab container because Tabcontainer shows only one tab at the time refer:
http://www.asp.net/ajaxlibrary/Tabs-Control.ashx[
^]. you can use any one control from div/panel/table In instead of use tab.
Please mark as answer if I m right.
Regards,
Aman