_selectedTreeListModel.clear();
final int volumeCount = _volumeList.getModel().getSize();
final Management management = _adminUI.getManagement();
if (management != null) {
for (int volumeIndex = 0; volumeIndex < volumeCount; volumeIndex++) {
final VolumeInfo volumeInfo = (VolumeInfo) _volumeList.getModel().getElementAt(volumeIndex);
final String volumeName = volumeInfo.getName();
try {
final TreeInfo[] treeInfoArray = management.getTreeInfoArray(volumeName);
for (int treeIndex = 0; treeIndex < treeInfoArray.length; treeIndex++) {
final TreeItem item = new TreeItem();