Focus method does not work for dropdown menu

Hi everyone, here is a small pb i encountered yesterday.

What I’m trying to do:

From a datepicker change event function, i want a dropdown menu to be focused on and the menu to be opened. However, when the datepicker is changed, nothing happens.

def datepicker_change(self, **event_args):
    self.dropdown.focus()

It does work for the datepicker (self.datepicker.focus()) though, it is opened and ready to select a date (and i suppose for some other components it works as expected too, only for the dropdown it doesn’t)

If anyone has a clue …