private void focusGoUp(Treerow treerow, int position) {
Treeitem parent = (Treeitem) treerow.getParent();
@SuppressWarnings("unchecked")
List<Treeitem> treeItems = parent.getParent().getChildren();
int myPosition = parent.indexOf();
if (myPosition > 0) {
// the current node is not the first brother
Treechildren treechildren = treeItems.get(myPosition - 1)
.getTreechildren();