/// <summary>
///
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
private void DeleteEducationalLevel_Click(object sender, RoutedEventArgs e)
{
_contentManager.DeleteEducationalLevel(_educationalLevelDictionary[_selectedEducationalLevel.Name],
_courseImagesCache[_selectedLanguage.Name]);
_educationalLevelDictionary.Remove(_selectedEducationalLevel.Name);
WrapPanelEducationaLevel.Children.Remove(_selectedEducationalLevel);
_selectedEducationalLevel = null;
WrapPanelGrades.Children.Clear();
NoOfFiles.Text = "";
NoOfLessons.Text = "";
NoOfWeeks.Text = "";
EditEducationalLevel.IsEnabled = false;
DeleteEducationalLevel.IsEnabled = false;
AddGrade.IsEnabled = false;
EditGrade.IsEnabled = false;
DeleteGrade.IsEnabled = false;
EditWeeks.IsEnabled = false;
EditLessons.IsEnabled = false;
EditFiles.IsEnabled = false;
}
