DEB_MainWindow gives you the opportunity to load elements using a specific JSON format. The default main window is defined in the app def found in main.json and is a object named mainwindow.

rect array
Can be a array of numbers or a object with the keys: left, top, right and bottom. The array of number have the order [left, top, right, bottom]
title array The name shown in the titlebar

The element that can be used