Just a quick update for anyone following this thread. Still struggling with the issue, and the more progress I make on the game, the bigger the problem is for me. As an example, I have an interactive minimap that is provided by the same underlying package. I have no problem getting it to "show up" - but I can't interact with it. Unfortunately, all of the interaction with the minimap is pretty much handled in a private class which I can't target with a UIEventTrigger.
So here's the thing. I need to basically figure out a way - an easy way, given the size of this project lol - to basically have NGUI handle the scripts that have NGUI handlers for things like OnClick, etc. And let the other stuff just fall through to the Update() method of this underlying package.
I tried creating a little "conduit" of sorts, using UIEventListener. It sort of worked - well, I was able to add a little method in the private class to basically act as a UICamera.genericEventHandler for things. My method was called when the events happened, but unfortunately, the event is already eaten by NGUI, so I can't just simply call his method which handles all the user interaction. I know that I have the gameobject, and obviously the event name (OnClick, etc.), but if I were to rely on those two pieces of information, I would end up having to hack the crap out of his class, which sort of defeats the purpose lol.
At any rate, thanks for listening .... I'm still open to any ideas out there. Again, I'm still on the early part of the learning curve with C#, Unity and NGUI - love all three! But at this rate, I may not have any hair left by this time tomorrow lol.
Cheers.