The implementation you are using seems to be correct and should work as expected. However please note that adding RadCodeBlock into the RadAjaxManager settings is not supported scenario. What should be the functionality you required by adding this settihng?
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the Telerik team
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in a listbox, the user could select multiple item (filename).
For each filename selected, i make a treatment. Obviously , i could put a progress bar for the sum of all treatment (3 treatments if the user select 3 files) but each treatment could be long (2->5 seconds) and I would prefer an indicator that indicate wich file is being treated.