if (treeModel != null)
	protected void installListeners()	{		tree.addPropertyChangeListener(propertyChangeListener);		tree.addFocusListener(focusListener);		tree.addTreeSelectionListener(treeSelectionListener);		tree.addMouseListener(mouseInputListener);		tree.addKeyListener(keyListener);		tree.addPropertyChangeListener(selectionModelPropertyChangeListener);		tree.addComponentListener(componentListener);		cellEditor.addCellEditorListener(cellEditorListener);		tree.addTreeExpansionListener(treeExpansionListener);		treeModel.addTreeModelListener(treeModelListener);	}