How to use builder connect_signals from gtk-rs

Hi, I've created some very simple GUI app, which basically has a main window and button in it. The GUI is created in Glade. Then in rust I am able to read and display successfully that window.
My question is, how to connect button's clicked signal declared in Glade so it connects with on_button_clicked defined in my code? I mean, I can see the docs but don't understand how to use it.
Thank you

Link to docs about connect_signals: