GtkSharp/gtk/IconSet.custom

                [DllImport("libgtk-win32-2.0-0.dll")]
                unsafe static extern void gtk_icon_set_get_sizes (
                        IntPtr raw, out int *pointer_to_enum, out int n_sizes);

                [DllImport("libglib-2.0-0.dll")]
		unsafe static extern void g_free (int *mem);

                /// <summary> Sizes Property </summary>
                /// <remarks> To be completed </remarks>
                public Gtk.IconSize [] Sizes {
                        get {

                            Gtk.IconSize [] retval;
                            
                            unsafe {
                                    int length;
                                    int *pointer_to_enum;
                                    gtk_icon_set_get_sizes (Handle, out pointer_to_enum, out length);
                                    retval = new Gtk.IconSize [length];
                                    for (int i = 0; i < length; i++)
                                            retval [i] = (Gtk.IconSize) pointer_to_enum [i];

                                    g_free (pointer_to_enum);
                            }
                            
                            return retval;
                        }
                }