private void MondayBtn_Click(object sender, RoutedEventArgs e)
{
MondayPage monday = new MondayPage();
controller.SelectDay(Week.WeekDays[0]);
NavigationService.Navigate(monday);
}
private void RemoveBtn_Click(object sender, RoutedEventArgs e)
{
controller.RemoveTask(controller.SelectDay(new Day()));
this.context.SaveChanges();
tasks.Items.Refresh();
}