Using NiGUI, open a second window from main window

[Trustable]

Here another example:
    
    
    import nigui
    
    app.init()
    
    var mainWindow = newWindow("Main window")
    var container1 = newLayoutContainer(Layout_Vertical)
    mainWindow.add(container1)
    var button1 = newButton("Open new window")
    container1.add(button1)
    
    var index = 0
    
    button1.onClick = proc(event: ClickEvent) =
      index.inc()
      var additionalWindow = newWindow("Window " & $index)
      var container2 = newLayoutContainer(Layout_Vertical)
      additionalWindow.add(container2)
      var button2 = newButton("Close")
      container2.add(button2)
      button2.onClick = proc(event: ClickEvent) =
        additionalWindow.dispose()
      additionalWindow.show()
    
    mainWindow.show()
    app.run()
    
    
    Run