All possible flags are:
GTK.AppPaintable,
GTK.CanDefault,
GTK.CanFocus,
GTK.CompositeChild,
GTK.HasDefault,
GTK.HasFocus,
GTK.HasGrab,
GTK.Mapped,
GTK.NoReparent,
GTK.NoWindow,
GTK.ParentSensitive,
GTK.RcStyle,
GTK.Realized,
GTK.ReceivesDefault
GTK.Sensitive,
GTK.Toplevel and
GTK.Visible.