DateTimePicker and nullable value

Is it really that the simplest solution of bringing closer together DataBinding and nullable types is to change a behavior of a control itself?

    class NullableDateTimePicker : DateTimePicker
    {
        [Bindable(true)]
        public object DBValue
        {
            get
            {
                if (this.Checked)
                    return base.Value;
                else
                    return System.DBNull.Value;
            }
            set
            {
                if (System.Convert.IsDBNull(value))
                    this.Checked=false;
                else
                    this.Value = Convert.ToDateTime(value);
            }
        }
    }

Though in the ideal case it should be solved at the databinding level instead of the custom control.