Button with selection menu option

I wanted to make a button with selection options just like the layer button on the top right. How can I add such a feature to a custom button?

the top right of what? Do you mean the hamburger menu on the forum?
Screen Shot 2020-05-18 at 5.11.25 PM

if not, you will need to provide more information.

Like this example using node-red-contrib-ui-contextmenu?

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