How can i add button to `ContextMenuShape`?

[rediffusion]

Duplicate link here!

How can i add some `button` or `menu` or `gallery` here ?


This `XML` code not working! Please help! (if i add the `Shapes` at the end it's also not working!).

<!--?xml version="1.0" encoding="UTF-8" standalone="yes"?-->
<customui xmlns="http://schemas.microsoft.com/office/2009/07/customui">
    <contextmenus>
        <contextmenu idmso="ContextMenuShape">
            <button idmso="About">

</button></contextmenu></contextmenus></customui>