Every software development team needs testers, but too many companies just won't hire them. This is one of the worst "false economy" moves you can make. Read my new article: Top Five (Wrong) Reasons You Don't Have Testers.
In my chapter on affordances and metaphors, I praised tab dialogs as providing a better metaphor and better usability than the listbox/combination dialogs that they replaced. I was barraged with mail saying, "yeah, tab dialogs are great, but not if you need more than one row of tabs!" Which is true. All the designs I've ever seen with multiple rows are terrible - they're either confusing, or they violate realism in some way.
Now, you could make a good case that if you have to have more than one row of tabs, your design is too complicated and it needs to be simplified. But if you can't do that, here's a way to do multiple rows that doesn't violate realism:
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