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Outside of the fact you use the virtual one when inheriting from a template control, nothing. Of course the template control may have had it's own update function set up in it's initialisation. Most likely from within XML which is where we usually have to do it.
Although I seemed to have missed Shinni's post. But not sure if that would have resolved my problem as it is usually the top level control that has the update routine set up in it.
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