ajax hovermenuextender control problem

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ASP.NET

Ajax

Hi All,

I am new to AJAX. I am trying to practice some examples. I am using hovermenuextender control,list box and text box like below. But list box is displaying without click in text box. How can I modify my code?

</asp:ScriptManager>
 <cc1:HoverMenuExtender ID="HoverMenuExtender1" runat="server"
            TargetControlID="TextBox1" PopupControlID="ListBox1" PopupPosition="Right"
            DynamicServiceMethod="GetDynamicContent">
</cc1:HoverMenuExtender>
<asp:Label ID="Label1" runat="server" Text="which language you want to learn " ForeColor="#CC3300"></asp:Label>
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:ListBox ID="ListBox1" runat="server">
 <asp:ListItem>Choose from these language only</asp:ListItem>
  <%--  Here we are adding Item in ListBox  --%>
  <asp:ListItem>C#</asp:ListItem>
  <asp:ListItem>J#</asp:ListItem>
  <asp:ListItem>VB</asp:ListItem>
  <asp:ListItem>Java</asp:ListItem>
 </asp:ListBox>

Regards,

N.SRIRAM