I've been playing a bit with it and haven't found the way to do it. Here is a link to the relevant part of the documentation: http://blueprintjs.com/docs/#components.forms.select
The desired functionality is like the one we can find in this framework: http://jedwatson.github.io/react-select/ but for design reasons I want to avoid mixing different UI frameworks.
If it is not possible, is there any way to style react-select so that it looks like a blueprintjs select?
Sorry, we do not currently support such a thing, but we're planning to in the near future! Dropdown and Typeahead are literally next on our components list. You can follow the discussion here: https://github.com/palantir/blueprint/issues/118.