void AddLesson()
{
LessonDialog dialog = new LessonDialog(host.CurrentTheme);
Lesson lesson = dialog.CreateObject(this);
if (lesson != null)
{
AddLessonNode(lesson);
treeLessons.Nodes[0].Expand();
}
}
void ButtonEditClick(object sender, EventArgs e)
{
Lesson lesson = CurrentLesson;
if (lesson != null)
{
LessonDialog dialog = new LessonDialog(host.CurrentTheme);
lesson = dialog.Edit(this, lesson);
if (lesson != null)
{
treeLessons.SelectedNode.Tag = lesson;
treeLessons.SelectedNode.Text = lesson.Name;
}
}
}