public void insert(TreeableReportRow newChild, int childIndex) {
if (newChild == null) {
throw new IllegalArgumentException("new child is null");
} else if (isNodeAncestor(newChild)) {
throw new IllegalArgumentException("new child is an ancestor");
}
TreeableReportRow oldParent = (TreeableReportRow) newChild.getParent();
if (oldParent != null) {
oldParent.remove(newChild);
}
newChild.setParent(this);
if (children == null) {
children = new Vector();
}
children.insertElementAt(newChild, childIndex);
}
public void remove(int childIndex) {
TreeableReportRow child = (TreeableReportRow) getChildAt(childIndex);
children.removeElementAt(childIndex);
child.setParent(null);
}