Web Toolkit (Wt): Tables in the Charts example have no frames

I am new in Wt. I installed Wt from

http://ift.tt/1QmmZ1C

with all the compiled binaries including the examples to my Win7 x64. I didn't compile anything yet. I just noticed that the Charts example running at my PC looks different than nice and cute

http://ift.tt/1SFrV5l

The tables don't have any frames. But reaction on clicks is there. I have read that ExtJS must be added. So (according to the instruction) I copied ext-base.js and ext-all.js to Wt\examples\charts\ and everything from resources to Wt\examples\charts\resources\ It didn't help. I also tried to copy them to Wt\examples\charts\ext\ and Wt\examples\charts\ext\resources\ It didn't help. And the same for 3.3.4. The folder tiny_mce was already in Wt\examples\charts\resources\ So I beleive I shouldn't do anything for it.

Do I miss anything or is it a bug?

Thank you