[Gtk-sharp-list] subclass a gtk.spinbutton

[David Cantin]

Hi, I'm trying to sublcass a spinbutton to get some extra behaviour but
I don't know to do it and i do not find any relevant example on the web.

what I have for now is the code below but I get errors related to null
pointer instance when I try to use my MySpinButton class.

using Gtk;
using System;

public class MySpinButton : SpinButton{

	static IntPtr myIntPtr;

	public static new IntPtr intPtr {
		get {
			return myIntPtr;
		}
		set {
			myIntPtr = value;
		}
	}

    public MySpinButton(Adjustment adj, double climbRate, uint digits) :
base(intPtr) {
    }
}

so if someone have any clues, it will be very appreciated

thanks

David