Is the dialog empty or the file browser control is loaded in it?
If the whole dialog is empty see this article: Blank Dialogs Problem
If only the folders and the files are not loaded then you should implement a file system content provider
and hook it with the DNN resource folders.
Another approach is to use our own DNN provider for RadEditor or the DNN provider for RadEditor (developed by the DNN Corp), which will automatically populate the Image Manager with images.
All the best,
the Telerik team
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