I did not say to add another create dynamic array behavior,
I said to add additional Populate List From Array behaviors.
lets review what you have done till now:
- you added the Create Dynamic Array server behavior
- You selected the parent list and added the populate list from array behavior to the onChange event.
what I am saying in my original response is to select the body tag, and add a Set Selected In List behavior, and populate list from array behavior for both the parent and child lists to the OnLoad event. This is very similar to the behavior you added to the parent list onChange event.