In my thread at http://forums.arcgis.com/threads/101760-Map-does-not-display?p=362307&posted=1#post362307, I reported a problem when I switched API from 2.x to 3.8: The TOC does function well. Per Ken's advisory, the TOC problem got solved, but the Zoom In/Out tool at the top-left of the panel becomes disabled. Hopefully someone can help me for this debugging.
Ken: Thanks for your time to review. I have solved this problem already just by multiple tries. Your info about JSBin is very useful. You feedback is to be credited as 'Solved'.