/**
* @see org.apache.tapestry.contrib.tree.model.ITreeSessionStateManager#getModel(Object)
*/
public ITreeModel getModel(Object objSessionState) {
ITreeStateModel objStateModel = (ITreeStateModel) objSessionState;
ITreeNode objParent;
if (m_strRootDir == null || "".equals(m_strRootDir)) {
objParent = new FileSystem();