I found out you can't use ajax controls along with telerik controls.
answered on 10 Aug 2010, 03:20 PM
The scenarios where the RadFileExplorer control is updated using AJAX are not supported. The RadFileExplorer uses a UpdatePanel internally and when two or more nested AJAX requests are initiated, then the result becomes unpredictable. This is why, I recommend you to exclude the RadFileExplorer from the partially updated region. The most efficient way to do this is to use a RadAjaxManager control and explicitly specify the controls to be updated.
I hope this helps.
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