A small example of creating a Gtk# DrawingArea with Boo

smallboogtkdrawingareatest.boo

namespace BooGtkTest
import System
import Gtk
import Cairo

class DrawingTestWidget(DrawingArea):
   
    public def constructor():
       self.ExposeEvent += ExposeHandler


    def ExposeHandler(o as object, ea as ExposeEventArgs):
        Console.WriteLine("Aqui")
   
        area = o as DrawingArea
        
        using context = Gdk.CairoHelper.Create (area.GdkWindow):
           context.Color =  Color (0,0255,0)
           context.Rectangle (0, 0, 90, 90)
           context.Fill()
           (context.Target as IDisposable).Dispose()

        ea.RetVal = true