@Override
void onSubmit()
{
final GanttTaskImpl root = (GanttTaskImpl) ganttChartData.getRootObject();
final Integer nextId = root.getNextId();
ganttObject.addChild(new GanttTaskImpl(nextId).setVisible(true).setTitle(getString("untitled")));
final Set<Serializable> openNodes = getOpenNodes();
openNodes.add(ganttObject.getId());
refreshTreeTable();
setOpenNodes(openNodes);
form.getParentPage().refresh();