Thanks for response. Indeed, I didn't properly understood your approach. Please see the image in attachment. There is layout of a complex board with latest Altera Stratix 5. Thousands of nets ... How, for example, mark-out the net Gxbrxln_10 (please, see on the image). Checking Gxbrxln_10 Net column cell , then selecting particular color changes nothing. I still cannot distinguish this net among thousands others.