Show and hide inputs based on Product and Category IDs combination

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I'm trying to get the value of a input/ProductCategoryInput by listening to the event evt_productCategorySelected that this widget fires from inside another custom widget, extended from input/FormInput, just how this post says to: https://cloudcustomerconnect.oracle.com/posts/da1478f303

The input that is linked to Incident.Product works fine and it gives me back the value that I want, but the one that is linked to Incident.Category does not. I mean, it fires the event but it doesn't give me neither the value or label that is returned with the product. They are both using the standard widget, but only one is returning the value of the selected item. Does anybody knows why?