Cannot add items to HierarchicalCollectionView when parent is a leaf

Question

Hi,
I cannot use the addChild function on a hierarchicalCollectionView object, when the parent element is a leaf node.
When the selected node already has children, it works, but if the new node would be the first child, addChild returns false.
How can I add a new child to a leaf?
Attached you'll find a small example (rename .txt to .mxml then). Try to click on the button when "Part1_1" is selected in the tree. -> doesn't work. If any other nodes are selected, it works.
Thanks a lot for you help,
Bye,
Fritz

Answer 1

Hi,
i found the solution myself. You've to extend the HierarchicalData class and override the canHaveChildren function to automatically allow every node to have children.
package {
    import mx.collections.HierarchicalData;
    public class EditableHierarchicalData extends HierarchicalData {
        public function EditableHierarchicalData(value:Object = null) {
            super(value);
         * Override this method to allow any node to have a children.
        override public function canHaveChildren(node:Object):Boolean {
            return true
Bye,
Fritz
PS. I found this solution in an example of ILOG Elixir's OrgChart.