There are a lot of questions asked about cordylines, probably as they have suffered from the bad winter we had. I don't know much about this plant but if you look at the gardening questions page, to the right under "by popular genus", you may get your answer here. Good luck...:o)

If there's no new growth shooting from the top by mid April (another week or so) then you can try cutting the plant down by half, or to the base, in hopes this might persuade new shoots to arrive. Otherwise, it hasn't coped with the winter and may die.