Question Is there a callback for when an element is added to a UIDocument?

I need a means of determining when an item has been added to a UIDocument's panel, nondependent on hierarchy depth. I have tried registering an AttachToPanel callback to the visualTree of the UIDocument's rootVisualElement, but it is not getting called.

My particular use case is localization. The UI I am developing is very dynamic, and I wish to scan all the text elements/controls/forms as they get added from a LocalizationManager and replace marked text fields with values queried from a localization table. If I can get a notification when a control has been added to the Document, then I can easily query it from the manager and apply localization.

Is there any way of achieving this?

 

try register AttachToPanelEvent
https://docs.unity3d.com/Manual/UIE-Panel-Events.html

 

I am currently doing this. I think the issue is that, according to my understanding, AttachToPanel is sent to child elements when they have been attached to a given panel. I need an event bubbling up to the panel itself to know when anything has been added or removed.

 

I'd be interested in an answer to this question as well. How can a parent know that a child has been attached?