Oh yes, that indeed makes a dramatic and total improvement. I'm totally convinced
var win = new qx.ui.window.Window("First Window"); win.setWidth(300); win.setHeight(200); this.getRoot().add(win, {left:20, top:20}); win.open();
#include <QtGui> int main(int argc, char *argv[]) { QApplication app(argc, argv); QWidget win; win.setWindowTitle("First Window"); win.resize(300, 200); win.show(); return app.exec(); }