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scriptmanager in conjunction with toolkitscriptmanager using UpdatePanel

I need some help here.
I have a page which I am using the ToolkitScriptManager for the use of some AJAX Calendar Control Extenders, and that works fine.
Where I am running into a problem is using the UpdatePanel. I am not getting a partial or any postback on a listbox control. I have attached snippets of my code. How it is supposed to work is when a user clicks on an item in the Listbox it should update the lblLeads Label. Of course it should do this using Ajax, without doing a Postback noticeable to the user.

I have tried adding the regular ScriptManager and I get errors and when I have both of them loaded, ToolkitScriptManager and ScriptManager, I get an error saying that you can only have one Scriptmanager on the page.

Please help.

Thanks in advance.
<form id="form1" runat="server">
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="server">

little further down... 

[List box code]
<td class="style7">
&nbsp;<asp:ListBox ID="ListBox1" runat="server" SelectionMode="Multiple" Width="199px" DataSourceID="ObjectDataSource2" DataTextField="Col001" 
DataValueField="Col001"                onselectedindexchanged="ListBox1_SelectedIndexChanged"></asp:ListBox>

little bit further down...

[Update Panel code]
<td colspan="3">
<asp:UpdatePanel ID="UpdatePanel1" runat="server" UpdateMode="Conditional">
<asp:Label ID="lblLeads" runat="server" Font-Bold="True" ForeColor="Red"></asp:Label>
<asp:PostBackTrigger ControlID="ListBox1" />

[Code Behind for ListBox]
protected void ListBox1_SelectedIndexChanged(object sender, EventArgs e)
            string myLeads = "";

            for (int i = 0; i < ListBox1.Items.Count; i++)
                if (ListBox1.Items[i].Selected)
                    myLeads += ListBox1.Items[i].Value + ", ";

            if (myLeads.Length > 0)
                myLeads = myLeads.Substring(0, myLeads.Length - 2);

            lblLeads.Text = myLeads;

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1 Solution
Shaun KlineLead Software EngineerCommented:
List boxes do not cause a postback unless you specifically mark them with the AutoPostBack="True" property.
jljaleahyAuthor Commented:

Thanks for the quick response. I set that propert to true before, but failed to mention it in the post.

the problem with setting it to true, is that I get a regular postback, not an AJAX type postback, which I am looking for.

Any help is appreciated.

Thansk again.
Shaun KlineLead Software EngineerCommented:
Instead of a postback trigger, try an asyncpostback trigger.
<asp:AsyncPostBackTrigger ControlID="ListBox1" EventName="SelectedIndexChanged" />
(This worked with the asp.net script manager.)
jljaleahyAuthor Commented:
Thanks Shaun,
I had tried the Async but not in conjuction with the autopostback = true.

Thanks again.

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