CalendarExtender throws error after manual textbox input

Hya,

I'm encountering a few issues with the calendarextender on the new RTM, i just have a textbox, a image, and the extender on a blank page:

<asp:ScriptManager ID="ScriptManager1" runat="server"></asp:ScriptManager><asp:Label ID="lblPublishDate" runat="server" AssociatedControlID="publish_date" Text="Publish Date:"></asp:Label><br /><asp:TextBox ID="publish_date" runat="server" CssClass="frm_textbox" Width="150px" ValidationGroup="SearchLatestNews"></asp:TextBox><asp:Image runat="Server" ID="imCalendar" CssClass="vm" ImageUrl="/images/calendar.png" /><br /><em>e.g. 01 Jan 2007</em><ajaxToolkit:CalendarExtender ID="extCalendar" runat="server" TargetControlID="publish_date" PopupButtonID="imCalendar" />

The data format is dd MMM yyyy and i want to allow the user to manually input the data aswell as picking it. and i get the following error in both IE and FF:

Error: [Exception... "'Sys.ArgumentUndefinedException: Sys.ArgumentUndefinedException: Value cannot be undefined.
Parameter name: array' when calling method: [nsIDOMEventListener::handleEvent]" nsresult: "0x8057001c (NS_ERROR_XPC_JS_THREW_JS_OBJECT)" location: "<unknown>" data: no]

Is anyone experienced the same issue? Is there a known workaround?

Kind Regards,

P.

Sorry i was doing some tests, and i accidentally removed the format="dd MMM yyyy" from the code..