Hello SP Bradley,
It is a difficult task to add additional columns in the file manager of the ImageManager dialog. How ever I can give you some pointers. First review the following KB article http://www.telerik.com/support/kb/aspnet-ajax/editor/sorting-radfileexplorer-items-by-name.aspx
. In it you will find information how the modify the dialog. Then review the following online demo FileExplorer / Add custom columns.
There is explained how to add custom columns to the control.
All the best,
the Telerik team
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