JQuery Validate odd behaviour with the ASP.NET Script Manager

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I discovered the JQuery Validate plugin a while back and could never get it to work in ASP.NET until today and though I have no idea why this the code bellow does not work.

<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server">
    <CompositeScript>
        <Scripts>
            <asp:ScriptReference Path="~/Assets/Javascript/jquery.validate.pack.js" />
        Scripts>
    CompositeScript>
asp:ScriptManagerProxy>

If the extension is in the <CompositeScript> section it does not work, I will try to figure out why later but if it is removed from the <CompositeScript> it start to work again.

So the resultant code will look like this:

<asp:ScriptManagerProxy ID="ScriptManagerProxy1" runat="server">
    <Scripts>
       <asp:ScriptReference Path="~/Assets/Javascript/jquery.validate.pack.js" />
    Scripts>
asp:ScriptManagerProxy>