private void HideChild()
{
createQuizParentWindow.Dispose();
openQuizParentWindow.Dispose();
printQuizParentWindow.Dispose();
addSubjectParentWindow.Dispose();
analyticsParentWindow.Dispose();
createQuizParentWindow = new CreateQuizParentWindow();
openQuizParentWindow = new OpenQuizParentWindow();
printQuizParentWindow = new PrintQuizParentWindow();
addSubjectParentWindow = new AddSubjectParentWindow();
analyticsParentWindow = new AnalyticsParentWindow();
}
