Well, then not only red borders disapper, but also the blue highlight of fields background, so, users can't see where to type text. And that is bad(
So, the only way i can see - is to turn off highlight (app.runtimeHighlight = false;), and also, chance fields fillColor, like that:
enter: this.fillColor = "255,255,255";
initialize: this.fillColor = "204,215,255";
exit: this.fillColor = "204,215,255";
prePrint: this.fillColor = "255,255,255";
But this way there will be a lot of "monkeyjob" to change color setting of every field...