JComboBox selection and highlight problem of the selected item

Hi,
I have a question how can I make my newly added item to the combo-box selectable and highlighted. I am adding new items to my custom comboBox dynamically and I want whatever item I add to be selected by default. I am using my own custom ComboBoxModel that extends AbstractListModel and implements ComboBoxModel and TreeModelListener, and my custom Renderer that extends JLabel and implements ListCellRenderer. Because I am trying to get a tree structure in my comboBox model and that's why I have my own custom model and renderer. Now when I add a new node or item to my comboBox it is being added and shown in the combo-box textField, but as soon I pull down the combo-box my parent directory is selected though my current selection is the last node added. That's how I am adding new nodes and making it selectable
treeModel.insertNodeInto(tempNode, (DefaultMutableTreeNode)nodeCollection.lastElement(), 0);
int nodeTotal =((CMRGlobals.myTreeGlobals).getModel()).getSize();
Object lastNode = CMRGlobals.myTreeGlobals).getModel()).getElementAt(nodeTotal - 1);
((CMRGlobals.myTreeGlobals).getModel()).setSelectedItem(lastNode);
when I do this my node is added under my parentNode and is shown in the comboBox but when I try to pull down the combo my parent node is high lighted and when I move out of the combo-box my parent node gets selected and show in the combo-box though I haven't selected it,and the contents of my last node are shown. I am just writing my own custom model that simulates the effect of JTree. I am using these......
DefaultMutableTreeNode and
DefaultTreeModel
and in my JComboBox I am setting my model as
this.setModel(new myModel(treemodel));
this.setRenderer(new myRenderer());
I am building my own FileDialog that just works like FileDialog I have all the functionality except this problem.Thanks for any help. I know I have posted this same thread yesterday but I didn't get any response hoping now may somebody can help me.Thanks again

never mind I got it
Thanks

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