"Component is Reference - only" hidden in drafting

Hi,

I am using NX11 and TC 10. 

I have added few assemblies consisting of 100's of componentes in DRAWING specification, but when I am adding the BOM it is selecting all the parts from the navigatior. I am not able to make the components as REFERENCE ONLY because it is hidden. How to activate the option of "Component is Reference - only" in drafting environment.