Justoverclock I don't quite understand the question.
- Are you trying to generate a dropdown inside of a custom page or custom content that displays a discussion?
- Are you trying to modify the content of the dropdown on the discussion list / homepage?
- Are you trying to programmatically open the existing dropdown without user interaction?
If you want to create a dropdown with all native actions + actions added by extensions, you can obtain an ItemList of all buttons by calling importing and calling DiscussionControls.controls(discussion, context), where context is usually an instance of the component you are calling the method from, to allow extensions greater flexibility.
You can also use the underlying methods like userControls, moderationControls and destructiveControls to only get a subset of the buttons flarum/frameworkblob/v1.8.8/framework/core/js/src/forum/utils/DiscussionControls.js
To render a dropdown with that code inside, you can take a look directly at the source code of DiscussionListItem flarum/frameworkblob/v1.8.8/framework/core/js/src/forum/components/DiscussionListItem.tsx#L71-L99 (it's split across 2 methods but you can retrieve the controls at the same place you are returning the Dropdown. Flarum core uses more method to make extensibility easier.