I have implemented a custom FIleBrowserContentProvider successfully, and have it working with RadEditor.
Is there a way to cause the ImageEditor's Save functionality call a custom FileBrowserContentProvider?
Looks like the 'cannot write to folder' alert is getting hit in the _saveButtonClickHandler in ImageEditor.ascx:
var name = this.get_newImageName()+$get("NewImageExt").innerHTML;
if (!name || name.indexOf(separator) != -1)
I have not made any changes to any of this code.