private void EditClick(object sender, RoutedEventArgs e)
{
Button button = (Button)sender;
Classwork cw = (Classwork)button.DataContext;
EditAssignment edit = new EditAssignment(cw);
edit.Show();
}
private void btnNewAssignment_Click(object sender, RoutedEventArgs e)
{
EditAssignment editor = new EditAssignment();
editor.Show();
}