Trying to set up a TreeTable with glazedlists on a griffon app, as discussed on http://griffon-user.3225736.n2.nabble.com/Problem-expanding-TreeTable-nodes-td7578033.html

TreeTableTestModel.groovy

import ca.odell.glazedlists.BasicEventList
import ca.odell.glazedlists.DisposableMap
import ca.odell.glazedlists.FunctionList
import ca.odell.glazedlists.GlazedLists
import ca.odell.glazedlists.SortedList
import ca.odell.glazedlists.TreeList
...

    BasicEventList taskList = new BasicEventList ()
    //fake data
    Map data = [1:[id:1, name: 'elem 1', parentId: null], 2:[id:2, name: 'elem 1.1', parentId: 1], 3:[id:3, name: 'elem 1.2', parentId: 1], 4:[id:4, name: 'elem 1.1.1', parentId: 2]]
    //holds path to the tree root for fake data
    Map paths = [1:[data[1]], 2:[data[1], data[2]], 3:[data[1], data[3]], 4:[data[1], data[2], data[4]]]

    TreeList taskTreeList = new TreeList(new SortedList (taskList, {a,b-> a.key <=> b.key} as Comparator), new TaskTreeFormat(), TreeList.NODES_START_EXPANDED)

    public TreeTableTestModel () {
        taskList.addAll(data.values())
    }

    private class TaskTreeFormat implements TreeList.Format {
        public void getPath(List path, Object element) {
            def taskPath = getTaskPath (element.id)
            path.addAll (taskPath)
        }

        public boolean allowsChildren(Object element) {
            return true;
        }

        @Override
        public Comparator getComparator(int arg0) {
            return null
        }
    }

    def getTaskPath (def id) {
        return paths[id]
    }

}

TreeTableTestView.groovy

import ca.odell.glazedlists.swing.TreeTableSupport
...
    scrollPane {
        table(id:'taskTree') {
            tableFormat = defaultAdvancedTableFormat(columns: [
                    [name: 'title',     title: 'Name'],
                    [name: 'id',     title: 'ID']])
            eventTableModel(source:model.taskList, format:tableFormat)
            TreeTableSupport treeTableSupport = installTreeTableSupport(source:model.taskTreeList, index:0i)

            treeTableSupport.arrowKeyExpansionEnabled = true
            treeTableSupport.showExpanderForEmptyParent = true

        }
    }
...