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copied!<p>Tooltip support is actually provided by the <code>TableCellRenderer</code> directly. Your <code>TableCellRenderer</code> is a little muddled. It extends from <code>DefaultTreeCellRenderer</code> but makes no use of any of it's features, instead creating a new <code>Box</code>, <code>JButton</code> and loading icons each time a cell is rendered...</p> <p>This is going to increase your memory usage a slow you application down...</p> <p>Instead, try something like...</p> <pre><code>class PCellRenderer extends Box implements TreeCellRenderer { private Image imgToUse = null; private Image imgRollOver = null; public PCellRenderer() { super(BoxLayout.X_AXIS); JButton myButton = new JButton("test"); try { URL urlIcon = new URL("file:///C:/1.jpg"); // <===== change their the path to icons imgToUse = ImageIO.read(urlIcon); urlIcon = new URL("file:///C:/2.jpg"); // <===== change their the path to icons imgRollOver = ImageIO.read(urlIcon); } catch (IOException e) { e.printStackTrace(); } myButton.setRolloverIcon(new ImageIcon(imgRollOver)); myButton.setIcon(new ImageIcon(imgToUse)); add(myButton); } public Component getTreeCellRendererComponent(JTree ptree, Object pvalue, boolean psel, boolean pexpanded, boolean pleaf, int prow, boolean phasFocus) { // set the tooltip text here... // Maybe change the icon... return this; } } </code></pre> <p>Now, actually doing something...</p> <p>Renderers are rubber stamps. That are not actually life components. Think of them like photos. You can take a snap shot of your friends, but you can't interact with them...same thing here...</p> <p>Your idea of a <code>MouseListener</code> on the <code>JTree</code> is a correct one, in fact the <a href="http://docs.oracle.com/javase/7/docs/api/javax/swing/JTree.html" rel="nofollow">JavaDocs</a> actually have a demonstration of this...</p> <pre><code>public void mousePressed(MouseEvent e) { int selRow = tree.getRowForLocation(e.getX(), e.getY()); TreePath selPath = tree.getPathForLocation(e.getX(), e.getY()); if(selRow != -1) { if(e.getClickCount() == 1) { mySingleClick(selRow, selPath); } else if(e.getClickCount() == 2) { myDoubleClick(selRow, selPath); } } } </code></pre>

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