Duckbar's Track President can show list of full track names. See screen capture:

You can also copy track names to clipboard:
SONAR X3 Producer - [testi - Track] Track list
1 DHS_Disco Drum Loop 110_3_Rex (75)
2 DHS_Bass Line 110_4Bm_Rex (77)
3 FB_90_A_LP10_Rex (78)
4 RHG_120_B_LP03_Rex (79)
5 GB_82bpm_bongos+shakers_a2_Rex (81)
6 tth_drlp_130_desmond3_Rex (84)
7 091 PLP Loop 1 (85)
8 091 PLP Loop 1 (85)
Primary purpose of Track President is batch freeze/unfreeze tracks, but that's OT...:)