[TYPO3-mvc] f:widget.paginate lost filter objects

[Juan Manuel Verges]

Hi mates,
I did a function in some repository of one of my models and I render results
in fluid with a widget.paginate.
The problem is that when I go to other page it lost results of my function.
My function is a query that filter results with an object called $filtro
that I post to my indexAction.
But, when I click in other page, $filtro isn't POSTed then It lost filter.
What could I do?

Regards,
mvta