private void SaveBtn_Clicked(object source, RoutedEventArgs e)
 {
     if (newTestCaseName.Text != string.Empty &&
         newTestCasePath.Text != string.Empty)
     {
         ITestCase testCase = new TestCase(newTestCaseName.Text, Document, newTestCasePath.Text);
         testCase.AddOption("DefaultExpanded", DefExpanded.IsChecked.ToString());
         Page.TestCases.Add(testCase);
         Document.AddTestCase(testCase);
     }
 }