MAKING OBJECTS INVISIBLE in FileMaker 13 - the pros and cons:
Using the hidden object attribute not only works on text and tab control panels, but also other objects like portals and fields. These become completely invisible when the condition is true.
A few things to consider:
For tab panels this is an all-or-none deal – hiding one tab results in all tabs being hidden.
Table view will not hide objects – fields become visible if the user switches to this view; conditionally hiding obejcts is not intended as a new security model.
Scripts can still go to hidden objects, rendering the FileMaker 12 hidden tab method obsolete.
Individual objects can be hidden inside portals. Annoyed by icons appearing in portals where there is no data? Hide them.
Read the whole thing.