Problem creating a field with solutionModel

Hello, I’m having a problem with the solutionModel and don’t know exactly what happens. The point is, when i create a new element, and put into the form don’t show me, because stay in the header, en if i put under the last field dont show me, because stay in the title header, and not in the body part. I don’t know how to do exactly to put over the body, and not behind, in the title header, and stay visible the field. any idea?

Can you pls share your code?

Finally seems that all works, fine. I don’t made any change, but thanks for all.