Simple tooltip on slider

I’d be very grateful to learn how to make a simple tooltip when someone hovers over a slider. The gist of my code is:

using Gtk, GtkReactive, Gtk.ShortNames

notesSlider = slider(1:200, value = 1)
hbox = Box(:h)
push!(hbox, notesSlider)
vbox = GtkBox(:v)
push!(vbox, hbox)

The slider is well positioned and works, but everything I’ve tried to do to add a tooltip has failed, usually for syntax or underfined var reasons – including set_property, tooltip(), tooltip!(), etc.

Thanks for any help you can send.