Who calls "index( )" ???

[eluser]punchi[/eluser]
Hello,

Im doing a system for my degree in CI, I must do it in Oriented Objet, in MVC++ (a MVC where the Model layer cant interact with the View layer) and well.. I have a little problem doing the sequence diagram (UML)

This is one with the problem (in fact, every secuence have the same problem):

FIGURE

The controller "C_ModificarObra" calls the Model "Obra" to require some information (thats fine) BUT later, the controller must call his view "V_ModificarObra" but that arrow not must be there, because the view have no method.

So... How can I diagram the secuence??? Which class calls the method index()??? I couldnt find it, if anybody can help me plz..

Thank you! =)