Ajax Tab container not displaying any data in the form.

<ajax:TabContainer ID="TabContainer1" runat="server" AutoPostBack="true" ForeColor="Gray" CssClass="ajax__tab_custom"
            Height="100%" Width="100%"  ActiveTabIndex="0"  ><ajax:TabPanel ID="Tabpnlplasma" runat="server"><HeaderTemplate>Tab1</HeaderTemplate><ContentTemplate><asp:DropDownList ID="d1" runat="server" AutoPostBack="true"  ><asp:ListItem>0</asp:ListItem><asp:ListItem>1</asp:ListItem><asp:ListItem>2</asp:ListItem></asp:DropDownList><br /><asp:ListBox ID="l1" runat="server" AutoPostBack="true" ><asp:ListItem>1</asp:ListItem><asp:ListItem>2</asp:ListItem><asp:ListItem>3</asp:ListItem></asp:ListBox></ContentTemplate></ajax:TabPanel><ajax:TabPanel ID="TabPanel1" runat="server"><HeaderTemplate>Tab2</HeaderTemplate><ContentTemplate><asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="true" ><asp:ListItem>one</asp:ListItem><asp:ListItem>two</asp:ListItem><asp:ListItem>three</asp:ListItem></asp:DropDownList><br /><asp:ListBox ID="ListBox1" runat="server" AutoPostBack="true" ><asp:ListItem>one</asp:ListItem><asp:ListItem>two</asp:ListItem><asp:ListItem>three</asp:ListItem></asp:ListBox></ContentTemplate></ajax:TabPanel></ajax:TabContainer>

Hi All,

I am using an Ajax Tab Container and for some reason it is not displaying any data at all. I even called tabpanel1.visible=true on the server side.

What can I do to fix it??