Hi Santiago Dávila,
We tested the online demos locally on various versions of Firefox (v 3.5.3, v 3.5.7, v 3.6.0) and as Bart noted everything seems to run seamlessly. Unfortunately we cannot provide you with helpful advice based on the provided information so far -- do you recollect what changes did you make to your project around the time it stopped working?
the Telerik team
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