Thanks - I'm aware of that - but that is quite a lot of work to reproduce all the features that these dialogs have.  I thought  there may have been some method or somewhere I could override or control where those .aspx files get their list of files from? where I could pass in a list.

Is it possible to generate the list of media/image files that are shown in the dialogs such as the Insert Image dialog ourselves in code rather than by specifying a file path?    The problem we have is that the list of media are not in the file system.  I can generate the names and urls in code - just need some way of passing ...