Are there conditional displays?

I'm working on a C software that is using huge arrays of attributes 
(union for data+status flags). The problem is that I'm only interested 
in the attributes that are actually set (most of them aren't) and 
manually triggering the display is not feasible.

Basically I would like to display elements of an array of structures, if 
an element of the structure is non-zero.

-- 
Mgr. Simon Toth