How to expand a particular node in a CellTree?

I created a CellTree based on GWT sample (http://http://gwt.google.com/
samples/Showcase/Showcase.html), but with over 2 levels.

sample levels:
Category > ContentWidth

my app:
Category > ContentWidth > ContentWidth > ContentWidth > ...

In the sample, the cells are expanded as follows:
Showcase.java:

        // Expand the tree node associated with the content.
        Category category = treeModel.getCategoryForContentWidget(
            contentWidget);
        TreeNode node = mainMenu.getRootTreeNode();
        int childCount = node.getChildCount();
        for (int i = 0; i < childCount; i++) {
          if (node.getChildValue(i) == category) {
            node.setChildOpen(i, true, true);
            break;
          }
        }

How to expand a cell at a level below RootTreeNode?

Thanks

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