Custom Control - Best place for visual-tree generation?

I'm building a custom control (extending Canvas) which should present a chartflow diagram (nodes and connectors). It will be feeded through databinding and a dependency property (ItemSource). The control will generate:
1. Node-items (based on ItemSource)
2. Connectors (lines) between each and every node
3. An adornerlayer on most of the nodes
Should I generate this visual/logical -tree inside my ItemSourceUpdated -eventhandler? In the overrided ArrangeOverride method? Or whats best practice?

Please don't ask several questions in the same thread. Your original question was about where to add the visual elements when creating a custom Panel and now you are asking about adorners. Please close the thread by marking all helpful posts as answer when
your original quesion has been answered and then start a new thread if you have a new question.
Please refer to the following page for more information about adorners:
https://msdn.microsoft.com/en-us/library/ms743737(v=vs.110).aspx
Sorry but no, my original question was about where to place creation code for:
1. Node-items (based on ItemSource)
2. Connectors (lines) between each and every node
3.
An adornerlayer
on most of the nodes
Since you cant create adorners immediately after you have added a new elemented to the visual tree (and before the layout pass) your previous
answer was appreciated, but not sufficient.

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