gistfile1.rb

def make_event_button(window, x, y, button, type)
  case type
  when :press
    event_button = Gdk::EventButton.new(Gdk::Event::BUTTON_PRESS)
  when :release
    event_button = Gdk::EventButton.new(Gdk::Event::BUTTON_RELEASE)
  end
  event_button.x = x
  event_button.y = y
  event_button.button = button
  event_button.time = Gdk::Event::CURRENT_TIME
  event_button.window = window
  event_button
end

def left_click_on(widget)
  make_event_button(widget.window, 0, 0, 1, :press).put
  make_event_button(widget.window, 0, 0, 1, :release).put
end

left_click_on(gtk_button)