Thread: Creating SWT tree leaves

Hi. Old to IT, new to Java. Having trouble adding leaves to my tree. Developing a stand alone Java app using mainly SWT and Eclipse JavaEE on Windows.

The tree is like this:

root
------parentA
--------------childA1
--------------childA2
--------------childA3
------parentB
------parentC
--------------childC1
--------------childC2

My requirement: when a child is selected/clicked I want to create a grandchild (there could be from zero to say 12 grandchildren). Thus if user clicks/selects childA2:

root
------parentA
--------------childA1
--------------childA2
----------------------grandchildA21
--------------childA3
------parentB
------parentC
--------------childC1
--------------childC2

Codewise I have:

import javax.swing.tree.DefaultMutableTreeNode;

This I've tried but presumably there is a SWT approach that avoids swing?

import org.eclipse.swt.widgets.Tree;
import org.eclipse.swt.widgets.TreeItem;
.
.
final Tree tree = new Tree(shell, SWT.VIRTUAL | SWT.BORDER | SWT.CHECK | SWT.V_SCROLL | SWT.H_SCROLL | SWT.SINGLE );
        tree.setHeaderVisible(true);
        tree.setBounds(975, 00, 375, 600);
.
.
 void populate_tree() {
            	for(int x=1;x<number_of_lines;x++) {
            		if ( script_type[x].matches("S")) {
                                final TreeItem itemI = new TreeItem(tree, SWT.NULL);
            			itemI.setText(script_type[x] + "=" + x + "=" + script_item[x]);
            			x++;
            			while (! script_type[x].equals("S")) {
            				if ( script_type[x].equals("AB1")||script_type[x].equals("DB1")) {
            					TreeItem itemJ = new TreeItem(itemI, SWT.NULL);
            					itemJ.setText(script_type[x] + "=" + x + "=" + script_itemnumber[x] + "=" + script_item[x]); 
            					x++;
            					TreeItem itemK = new TreeItem(itemI, SWT.NULL);
            					itemK.setText(script_type[x] + "=" + x + "=" + script_itemnumber[x] + "=" + script_item[x]);
            				}  
            				x++;
            				if(x>number_of_lines) break;
                                }
            			x--;     
            		} 
            	}
            }
 
        }
.
.
.
                tree.addListener(SWT.Selection, new Listener() {
        	public void handleEvent(Event event) {
.
.

And it is here I've tried lots of options but while I do not get errors I do not get leaves. What seems odd is that I can see the selected/clicked child text but if I look at the index it is always 1. And I thought the index would let me create the leaf.

    TreeItem item = (TreeItem)event.item;
	            System.out.println("index=" + item.indexOf(item));

If anyone can give me any guidance or link to a good example that actually works while I still have hair it would be greatly appreciated.

Cheers