Tree expand in Sample XmlTree broken

The tree-expand in the sample XmlTree is broken.
That you can expand the tree with the JTree owned methods like "expandPath(TreePath)" the class XmlEntry must implement following methods:

public int hashCode()

{ return this.m_currentXml.hashCode(); }

public boolean equals(Object obj)

{ return this.m_currentXml.hashCode() == ((XmlEntry)obj).hashCode(); }