CG.Menu collects buttons an displays them with the defined margin

                        var menu = new CG.Menu({
                          x: 100,
                          y: 100,
                          margin: 10
                        })
                        
                        button = new CG.Button({
                           image: Game.asset.getImageByName('button'),
                           position: new CG.Point(Game.width2, 100),
                           text: 'Menu Button 1',
                           font: font,
                           callback: callbackTest
                        })
                        button.name = '#mbutton 1#'
                        menu.addButton(button)
                        
                        button = new CG.Button({
                           image: Game.asset.getImageByName('button'),
                           position: new CG.Point(Game.width2, 100),
                           text: 'Menu Button 2',
                           font: font,
                           callback: callbackTest
                        })
                        button.name = '#mbutton 2#'
                        menu.addButton(button)
                        
                        button = new CG.Button({
                           image: Game.asset.getImageByName('button'),
                           position: new CG.Point(Game.width2, 100),
                           text: 'Menu Button 3',
                           font: font,
                           callback: callbackTest
                        })
                        button.name = '#mbutton 3#'
                        menu.addButton(button)
                        
                        // add the menu to the layer
                        layermenu.addElement(menu)