How can i make it auto line alignment in ScriptUI?

I want that form recognize new line character. (like '\n')

So I programmed like this. But it's not working.

//////////////////////////////////////////////////////////////////////////////

var win =new Window ("dialog", "test");
win.orientation = "column";

var form1 = win.add ("edittext", undefined, "");
form1.onChanging = function(){
  if(form1.text.search("\n") == true){
   form2.active = true;
  }
}

var form2 = win.add ("edittext", undefined, "");

var form3 = win.add ("edittext", undefined, "");

win.show();

//////////////////////////////////////////////////////////////////////////////

How can i make it auto line alignment in ScriptUI?

Is it possible?