We use Xceed and Infragistics.
Both of them are actively developing. Xceed has a very active community and well-documented products.
Edit:
Before you select one lib, make sure you need it. Research forums on each library and check how other users were / were not able to solve their problems. Management libraries are good in standard scenarios, but if you want a more sophisticated solution, you will need to look into the forums / blogs about what you have done. This is why the community is important .
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