private void LoadDetails()
{
lblMainTitle.Text = "Szczegóły przypomnienie";
var rem = Reminders.FirstOrDefault(x => x.Id == SelectedReminderId);
if (rem.NotNull())
{
txtName.Text = rem.Name;
txtDescriptions.Text = rem.Description;
cmbType.SelectedIndex = (int)rem.ReminderType - 1;
calendarDate.SelectedDate = rem.DateAndTime.Date;
txtTime.Text = $"{rem.DateAndTime.Hour}:{rem.DateAndTime.Minute}";
}
spAddReminder.Visibility = Visibility.Visible;
}