The basic problem is that the javascript to popup the calendar on the user control works when the usercontrol is placed inside a repeater. However if you then wrap the repeater inside and AJAX update panel it works initially. But the calendar no longer pops up, once a partial postback has been initiated on the panel. In our particular case a postback is initiated when we change the number of items we want to see in the repeater, via a drop down list.  Here’s an example of the repeater inside a panel:

    <asp:UpdatePanel ID="updCentresPanel" runat="server" UpdateMode="Conditional">

        <ContentTemplate>

            <asp:Repeater ID="uxCentresRepeater" runat="server">

                <ItemTemplate>

                    <travelinfo:Centre ID="uxCentre" runat="server" />

                </ItemTemplate>

            </asp:Repeater>

        </ContentTemplate>

        <Triggers>

            <asp:AsyncPostBackTrigger ControlID="uxNumberCentresDropDown" EventName="SelectedIndexChanged" />

        </Triggers>

    </asp:UpdatePanel>

 Cheers in advance

Hi DottyWelsh,

register script that is needed to attach a calendar as follows:

 bool registered = false;
                ScriptManager Smgr = ScriptManager.GetCurrent(Page);
                if (Smgr != null)
                {
                    if (Smgr.IsInAsyncPostBack)
                    {
                        ScriptManager.RegisterStartupScript(this, this.GetType(), ClientID, InitScript, true);
                        registered = true;
                    }
                }
            if (!registered)
            {
                Page.ClientScript.RegisterStartupScript(GetType(), ClientID, InitScript, true);
            }

here "InitScript" is the variable of type String, that contains javascript you need to register.

Hope this helps