When set on a structure field array, the numElementsItem property identifies a JSF handler field or VGUIRecord field whose runtime value specifies the number of array elements to display. The property is used only for output and is meaningful only if set on a structure field array with a fixed number of elements.
The value of numElementsItem identifies the name of a JSF handler field or VGUIRecord field. The property is not valid for a dynamic array, which includes an indicator of how many elements are in use; for more information, see Arrays.