Mmmm sorry, the submenu is not opened with this :

    if (props.settings) {
      this.tagify.settings.whitelist = props.settings.whitelist;
      this.tagify.dropdown.show.call(this.tagify, 'somevalue');
    }

I need to get the random value from my whitelist ?

No need for a random value, or any value if you don't want to pre-filter the suggestions dropdown list

Okay.

My previous message don't work (with React component). Maybe i need other params ?

It should have worked. Check the function tagify.dropdown.show is actually called, debug Tagify itself. maybe i'ts not called..