Is this the override?

        Ext.define('TipFix', {
            override: 'Ext.tip.QuickTip',
            shrinkWrapDock: true
        });
Is everything set up correctly because it doesn't fix the issue in the code below?

<%@ Page Language="C#" %>
<%@ Register Assembly="Ext.Net" Namespace="Ext.Net" TagPrefix="ext" %>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head id="Head1" runat="server">
    <title>Ext.Net 2.x</title>
    <ext:ResourcePlaceHolder ID="ResourcePlaceHolder1" runat="server" Mode="Script" />
    <ext:ResourcePlaceHolder ID="ResourcePlaceHolder2" runat="server" Mode="Style" />
    <script type="text/javascript">
        Ext.define('TipFix', {
            override: 'Ext.tip.QuickTip',
            shrinkWrapDock: true
        });
    </script>
</head>
<body>
    <form id="Form1" runat="server">
    <ext:ResourceManager ID="ResourceManager1" runat="server">
    </ext:ResourceManager>
    <ext:Viewport runat="server" Layout="FitLayout">
        <Items>
            <ext:Panel runat="server">
                <TopBar>
                    <ext:Toolbar runat="server">
                        <Items>
                            <ext:Button ID="Button1" runat="server" Text="Some Test">
                                <ToolTips>
                                    <ext:ToolTip runat="server" ShrinkWrapDock="true" Anchor="top" Title="<nobr>Click here to do some test</nobr>">
                                    </ext:ToolTip>
                                </ToolTips>
                            </ext:Button>
                        </Items>
                    </ext:Toolbar>
                </TopBar>
            </ext:Panel>
        </Items>
    </ext:Viewport>
    </form>
</body>
</html>