Dear Dee,
On occasion, a MTF transgender person who was attracted to females as a man, is attracted to men after they have transitioned.
By the way, this is not homosexuality, as your sexual orientation is determined by your true gender (the gender you identify as) and the gender of the other person.
Ultimately, this question is resolved after you have transitioned.
As you progress in your transition, you will have more and more dreams as a woman, and fewer and fewer as a man.
Your friend,
Monica