How to change the color of the fill fields when I make a pdf form

Hi, i know that i can change the color by pressing right click on the field, going to properties > Aspect .

The problem is that even doe i put "No color", when i see the PDF it looks like this: 

Is there any way to change this "blue" color? in fact, i don't want any color. I want the fields to be "invisible", but people will know you can write on them because of the lines...

P.S.: If you tell me that is impossible to do this, i wont believe that after all these years, Adobe hasn't change that yet...