Habanero.Faces.Win.DateTimePickerControllerWin.DateTimePicker_KeyDown C# (CSharp) Method

        private void DateTimePicker_KeyDown(object sender, KeyEventArgs e)
        {
            if (!CheckBoxVisible)
            {
                if ((e.KeyCode == Keys.Back
                     || e.KeyCode == Keys.Delete))
                {
                    e.SuppressKeyPress = true;
                    if (ApplyBlankFormat())
                    {
                        FireValueChanged();
                    }
                }
                else if (e.KeyCode != Keys.ShiftKey && IsNull())
                {
                    ApplyValueFormat();
                }
            }
        }