MouseEvent#dragging

I'm trying to use the dragging method of the MouseEvent, but with no
success.
Here is the code:

require 'rubygems'
require 'wx'
include Wx

class MyApp < App
  def on_init
    @frame = Frame.new(nil,-1, "Wx", DEFAULT_POSITION,
Size.new(200,200))

    evt_left_down() { | event | drag(event)}

    @frame.show
  end

  def drag(event)
    puts event.dragging
  end
end

app = MyApp.new.main_loop

I always return false, even when i'm draging the mouse.
I don't know what is wrong.

Any help?
Thanks
--

-- 
Posted via http://www.ruby-forum.com/.