Idoc info req??

hi

I am having a doubt in Idoc in creating Model view.

I had made a Z-segment,infotype,message type & in WE82 had assigned the infotype to message type.

But when i m craeting am model view I am trying to add ths z message type to model view,its not showing my Z message type in the list.

So please tell me why its not showing it.what thing I need to do.

Also please tell me how to send idoc for a zmessage type.I had made a segmant for vendor fileds,also plese tell me from where I shld fill the data in segment or it will automaticaly fect the data & will send it correspondingly.

vipin