QtRuby: Check Box not toggling - ruby

Question

I have created a Checkbox with label AVS . When I click the checkbox, I need the below block of code to be executed. I am neither getting any error, nor is the toggle working.
require 'Qt'
class Auth < Qt::Widget
slots 'on_toggled(bool)'
def initialize(parent=nil)
super(parent)
setWindowTitle("Org");
setFixedSize 750,530
avs_ui
show
end
def avs_ui
#label = Qt::Label.new "AVS?: ", self
#label.setFont Qt::Font.new("Times New Roman", 14)
cb = Qt::CheckBox.new " ",self
cb.setChecked false
connect cb, SIGNAL("toggled(bool)"), self, SLOT("on_toggled(bool)")
#label.move 65,130
cb.move 170,130
end
def on_toggled state
if state
#lineedit = Qt::LineEdit.new(self)
#lineedit.setFont Qt::Font.new("Times New Roman", 12)
#label = Qt::Label.new "Address: ", self
#label.setFont Qt::Font.new("Times New Roman", 14)
#label.move 380,130
#label.resize 170,20
#lineedit.move 500,130
#lineedit1 = Qt::LineEdit.new(self)
#lineedit1.setFont Qt::Font.new("Times New Roman", 12)
#label1 = Qt::Label.new "Zip Code: ", self
#label.setFont Qt::Font.new("Times New Roman", 14)
#label.move 420,160
#label.resize 70,20
#lineedit.move 500,160
end
end
end
app = Qt::Application.new(ARGV)
widget = Auth.new
widget.show
app.exec
Can someone let me know what changes I should make so that, when I click the checkbox, I get the other required widgets?