JavaScript InDesign dialog window .orientation deprecated

Hello,

I am currently going through Peter Kahrel's "ScriptUI for Dummies" book, and there is a piece of code to make a dialog window with user input that I tried out:

var myWindow = new Window ("dialog", "Window title");
    myWindow.orientation = "row";
    myWindow.add ("statictext", undefined, "Prompt:");
    var myText = myWindow.add ("edittext");
myWindow.show ();

This works, but .orientation is striked through, which as I understand means this feature will not be supported anymore in the future. What should I be using instead?

Thanks,

Heidi