thanks

that "autosave" option is IDE internal.
maybe it is possible to provide hidden autosave from add-in via enumeration of IDE windows and saving them, but it was looking to me (long ago) little tricky, so i just send "Save Project" to the main window, thus this dialog appeared.
i thought it does not disturb too much, as i use "Ctrl+Enter" to call "Go All", so my finger is already on "Enter" key