I don't think there is an easy way to implement this functionality in the dialogs. The file lister component is a server control. The file browser we use in the dialogs is of type Telerik.Web.UI.Widgets.GenericFileLister
. If you override it or its base class (Telerik.Web.UI.Widgets.FileLister
), you can change the rendering and add a new column. Then, you will need to customize the Image manager dialog and replace the GenericFileLister control with your own.
We plan to make the file lister control a normal .ascx file (user control) instead of a server control in the future. However, this change is currently with low priority.
All the best,
the Telerik team