/// <summary>
 ///     Resets all input elements for students
 /// </summary>
 /// <param name="sender"></param>
 /// <param name="e"></param>
 private void ClearStudentForm(object sender, RoutedEventArgs e)
 {
     if (studentModel.IsEdit)
     {
         studentModel.CancelEdit();
     }
     else
     {
         studentModel.Clear();
     }
 }