If you mean MVC, you cannot (or, rather, should not). Data is not "displayed" in a controller at all, no matter "one" or "another". Data presentation is done in a view. So, the problem should be reformulated somehow, but… the view is not manipulated directly by a controller, as you can see on the
collaboration diagram describing MVC patter:
http://en.wikipedia.org/wiki/Model%E2%80%93view%E2%80%93controller[
^].
So, as to your possible concerns, the key is the isolation between a view and a controller, which, in principle, would allow you to add yet another controller
without redefining the view(s). It reduced your problem just to the perceiving of the pattern correctly. You can consider this as a case of
loose coupling between views and controllers; see also:
http://en.wikipedia.org/wiki/Loose_coupling[
^].
—SA
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