I would like to provide a Tab Close Menu example:

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<!DOCTYPE html>
<html>
<head runat="server">
</head>
<body>
    <ext:ResourceManager runat="server" />
    <ext:TabPanel Width="450" Height="100" Border="true" runat="server">
        <Plugins>
            <ext:TabCloseMenu runat="server" />
        </Plugins>
        <Items>
            <ext:Panel Closable="true" Title="Tab 1" Html="Content" runat="server" />
            <ext:Panel Closable="true" Title="Tab 2" Html="Content" runat="server" />
            <ext:Panel Closable="true" Title="Tab 3" Html="Content" runat="server" />
        </Items>
    </ext:TabPanel>
</body>
</html>