How to change JTree's node icon manually?

Hi, I'm currently making messenger application using awt and swing. I've searched in google and here(got this), but till now I haven't got solution.
I want to change user's status icon in the buddy list if the user's status is changed(such like offline and online).
But for now I want to try to change the icon directly by pressing a button first before thinking about listener for the status.
I have this tree
     CustomCellRenderer rosterTreeRenderer = new CustomCellRenderer();
        DefaultMutableTreeNode rosterRoot = new DefaultMutableTreeNode("root");
        DefaultMutableTreeNode rosterGroup = null;
         rosterGroup = new DefaultMutableTreeNode("group 1");
         rosterRoot.add(rosterGroup);
         rosterGroup.add(new DefaultMutableTreeNode("abc"));
         rosterGroup.add(new DefaultMutableTreeNode("dce"));
         rosterGroup = new DefaultMutableTreeNode("group 2");
         rosterRoot.add(rosterGroup);
         rosterGroup.add(new DefaultMutableTreeNode("zzz"));
         rosterGroup.add(new DefaultMutableTreeNode("xxx"));
         rosterGroup.add(new DefaultMutableTreeNode("yyy"));
            rosterTree.setCellRenderer(rosterTreeRenderer);This is the cell renderer
public class CustomCellRenderer extends DefaultTreeCellRenderer
     private static final long serialVersionUID = 1L;
     public CustomCellRenderer(){
        public Component getTreeCellRendererComponent( JTree tree, Object value,
                boolean isSelected, boolean expanded, boolean leaf, int row,
                boolean hasFocus )
          DefaultMutableTreeNode node = (DefaultMutableTreeNode)value;
          String     labelText = (String)node.getUserObject();
          if (isSelected)
               System.out.println("selected");
               this.setIcon(UIManager.getIcon("Tree.openIcon"));
               //((DefaultTreeModel) tree.getModel()).nodeChanged(node);
        else if (leaf) {
            this.setIcon(UIManager.getIcon("Tree.leafIcon"));
          } else if (expanded) {
               this.setIcon(null);
          } else {
               this.setIcon(null);
          setText(labelText);
          return this;
    public Color getBackgroundNonSelectionColor() {
        return(null);
    public Color getBackground() {
        return(null);
}Whenever I click the user, the user's icon change, the first phase of my testing is working.
But after that I'm confused, how can I change the icon when I click a button at the roster frame. How to invoke and send parameter to change icon of specified user? I already read DefaultTreeCellRenderer javadoc but still haven't found clue to what I wanted, most of the methods noted with "Overridden for performance reasons".
I've already searched for several days for this problem.. Hope someone can help me..
Thanks

Sorry I don't know how to delete my question from other forum. I also don't know about crossposting rule(I don't go into javaranch).
I'm learning java by google and I'm really confused now, everyone I asked in real life doesn't know the solution. I'm doing a thesis making chat messenger, my lecturer also doesn't know how to solve my problem.
Sorry I really don't know about the crosspoting rule. I only read the rule from each forum.
Can someone help me please? :(

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