if ((prevVersion != null)
&& (prevVersion.getExpiringDate() != null)) {
startDateLabel.setValue(prevVersion
.getExpiringDate().toString());
}
startDateTreecell.appendChild(startDateLabel);
treerow.appendChild(startDateTreecell);
// append expiring date of the current work week
Treecell expiringDateTreecell = new Treecell();
Label expiringDateLabel = new Label("---");