The event SEL_KEYRELEASE is not triggered correctly on a #FXButton.

FXButton SEL_KEYRELEASE not working.rb

#encoding: utf-8

require 'fox16'
include Fox


class HelloWindow < FXMainWindow
  def initialize(app)
    ventana = super(app, "Hello, World!", width: 600, height: 400)
    a = FXPacker.new(ventana, opts: LAYOUT_FILL)

  	MiBoton.new(a)
  end
  
  def create
    super
    show(PLACEMENT_SCREEN)
  end
end

#########################################################################

class MiBoton < Fox::FXButton

  def initialize(widget_padre)
		super(widget_padre, 'Testing')
		connect(SEL_ENTER) do |sender, selector, data|
			setFocus
			puts "SEL_ENTER"
			if (data.state & CONTROLMASK).!=(0)
				puts "with ctrl"
			else
				puts "without ctrl"
			end
		end
		connect(SEL_LEAVE) do |sender, selector, data|
			killFocus
			puts "SEL_LEAVE"
		end
		connect(SEL_LEFTBUTTONPRESS) do |seneder, selector, data|
			puts "SEL_LEFTBUTTONPRESS"
			if (data.state & CONTROLMASK).!=(0)
				puts "with ctrl"
			else
				puts "without ctrl"
			end
			0
		end
		connect(SEL_KEYRELEASE) do |sender, selector, data|
			puts "SEL_KEYRELEASE"
		end
		connect(SEL_KEYPRESS) do |sender, selector, data|
			puts "SEL_KEYPRESS"
		end
	end
end

#############################################################

if __FILE__ == $0
  FXApp.new do |app|
  	HelloWindow.new(app)
    app.create
    app.run
  end
end