private void BtnRegisterPatron_Click(object sender, System.Windows.RoutedEventArgs e)
        {
            if (UIElements == null)
            {
                UIElements = ScreenRegisterPatron.Children;
            }

            if (!EmptyInputValidator.Validate(UIElements))
            {
                if (!DateTimeValidator.InvalidDates(new List <DatePicker> {
                    txtBirthdate, txtDeath
                }))
                {
                    if (!DateTimeValidator.CompareDates(txtBirthdate, txtDeath))
                    {
                        ExecuteAction(BtnActionPatron.Content.ToString());
                    }
                    else
                    {
                        MessageControl.InvalidDateRange().ShowMessage();
                    }
                }
                else
                {
                    MessageControl.InvalidDates().ShowMessage();
                }
            }
            else
            {
                MessageControl.EmptyInput().ShowMessage();
            }
        }