//when the user clicks the add doctor button +
        private void addDoctorButton_Click(object sender, RoutedEventArgs e)
        {
            NewDoctorWindow newDocWindow = new NewDoctorWindow(false);   //false-> clear edit mode

            newDocWindow.Owner = this;
            newDocWindow.Show();
        }
 //when the user clicks the edit doctor button
 private void editDoctorButton_Click(object sender, RoutedEventArgs e)
 {
     if (docListGrid.SelectedItem != null)
     {
         Doctor          doc          = (Doctor)docListGrid.SelectedItem;
         NewDoctorWindow newDocWindow = new NewDoctorWindow(doc.Name, doc.Days, doc.Hours, true); //true -> set edit mode
         newDocWindow.Owner = this;
         newDocWindow.Show();
     }
 }