The files type exposes the following methods.
|count||Returns the number of files actually contained in the upload pane.|
|get(Number)||Returns the file at the specified index.|
|remove(Number)||Removes the file at the specified index from the upload pane.|
|removeByGuid(String)||Removes the file with the specified GUID from the upload pane.|
|totalFileSize||Returns the total size of files selected for the upload.|