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I had the same problem, and your code works fine, thanks. However, I have an issue when I apply the tDropDownList method on an element that I cloned with the jQuery clone method. In the previous example, I would clone the containing div, and then change the id and name properties of the hiddent input. There is no error, but the list is not filled. Would you have any suggestion? It seems that some initialization is missing.
Update: please ignore, it works: I had a typo in my code!