What is the correct root object from which to build a new component?

[Andy Burnett]

I suspect this is a very basic question.

I would like to use Pier as the basis of a group brainstorming system.  In
order to do this, I need to build a new component that would have a small
text entry box, and a list display holding all the entries.

It seems as though some other components have subclassed PRWidget, but not
all of them. So, before I go shooting off down the wrong path, could someone
explain if there is a best starting point?

Cheers
Andy
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