You can use the RadFileExplorer client API to raise an event each time a folder is clicked(selected) or opened (loaded). See the following example for more details - http://demos.telerik.com/aspnet-ajax/fileexplorer/examples/clientsideevents/defaultcs.aspx
If you don't want to display the files, you need to customize the file explorer's content provider. The following example shows how to filter files and folders - http://demos.telerik.com/aspnet-ajax/fileexplorer/examples/filteranddownloadfiles/defaultcs.aspx
. Your case is much simpler - you only need to override the
method to filter files and simply return an empty collection where the files should be.
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