adding subs to DVD with TMPGenc DVD author?

[freebutterflyx]

The programs I use to convert avi -> DVD are TMPGEnc and VDUB (to frameserve with subs). I use TMPGEnc DVD author to auther the dvd. Until now i used fixed subs in the mpeg file (with vdub frameserver).
But now i want to make a dvd with switchable subs like a dvd you buy. I tried ifoedit to mux video, sound and subs into an ifo file but then if i use tmpgenc dvd author with this ifo-file to make the menu, i can't select the subs anymore in my dvd-player.

Does anyone have any suggestions to make this work or how i can do it? (I don't want to buy any additional authoring programs)

[Baldrick]

you can't use tmpgenc dvd author. but you can use dvdauthorgui! freee but not as simple as tmpgenc dvd author then.