Location Window

I'm having a bit of trouble with this.  I can display the window and all, but I'm trying to make it fancy and fade-in and out.
The thing is, I want the window to display for like 3 seconds and then dispose.  However, I don't want the game to pause, I want it to be like a Parallel Process.
I've came up with one way to accomplish this, but it just isn't working out for me... Any help would be appreciated!

This is what I have so far:

Code: [Select]

#==============================================================================
# = Window_Location
#==============================================================================

class Window_Location < Window_Selectable
  def initialize(x, y)
    super(x, y, 200, WLH + 32)
    self.opacity = 0
    refresh
  end

  def refresh
       frames = Graphics.frame_count + 120
       self.opacity += 10 while frames > Graphics.frame_count
      self.contents.clear
      self.contents.draw_text(0, 0, self.width - 32, WLH, $mapname, 1)
  end
end