Called once, after the node's built-in UI is fully constructed and before its VisualElement is attached to the graph view.
This is the recommended entry point for allocating custom UI and adding it to
INodeView.Root. It fires exactly once per view instance, so any element allocated
here can be safely cached in a field.
If the node is culled and later revealed, the contents of INodeView.Root are cleared;
re-add your cached elements from NodeView<T0>.OnCullingChanged (when cullingEnabled is
false). Prefer this pattern over allocating a fresh element each time.
Label m_Label;
public override void OnViewBuilt() { m_Label = new Label($"Node: {Node.Title}"); View.Root.Add(m_Label); }