Xseries :: X3-02 Change A Contact On An SMS

I find I sometimes type an SMS and then select <CONTACTS> but inadvertantly hit the wrong contact --- the touch screen is rather sensitive. I can't find a way of changing the contact to the right person. I usually transfer it to <DRAFTS> in the hope that I may be able to deal with it there (that is, change the addressee) so I don't have to type it all out again, but it seems that it's not possible. So I end up just deleting it. So is there a way of changing the contact to a message if you make a mistake? I suppose I should select the contact first, and then type the message. However as the X3 gives you the option of writing a message and then sending it, it's normally what I do.