Actually I was over complicating it. The following work better:
@Override
protected void onJunctionLinkClicked(AjaxRequestTarget target, TreeNode
node) {
// expand the next level of the model
modelChanging();
if (isNodeExpanded(node)) { // node has already been (un)expanded
for this cycle
m_dataProvider.expand((DefaultMutableTreeNode)node, 1);
} else {
// otherwise delete the children and replace with our marker
node
m_dataProvider.expand((DefaultMutableTreeNode)node, 0);
}
// trigger redraw of clicked node
treeNodesChanged(new TreeModelEvent(this, new
TreePath(node.getParent()), new int[]{0}, new TreeNode[]{node} ));
modelChanged();
super.onJunctionLinkClicked(target, node);
}
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