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Thank you very much for your reply. Unfortunately I can't provide code sample. But among trying you're suggestions, i found out the element on my page that is interfering with this grid normal behaviour is a ScriptManager. The grid is inside an UpdatePanel, and I need the ScriptManager or i will get an error on the page. But if i don't use an UpdatePanel everything works perfect. Im not using a master page for this one. Any ideas?
An update: with ScriptManager, the grid doesn't appear if it is inside a <div></div>. Once I removed these tags, the grid appeared, it behaves normally, but the theme is no longer applied. Again, if I remove the ScriptManager, everything is ok, themes are applied as well.