I need some help with ControlP5window control. I am trying to create a multi window application where a small control window is used to transform an image. I can add buttons and slider to the control window and change use it to transform the image added to the main window. However I am unable to add a drop box or list box control using the property 

     .setWindow(controlWindow)

I use the following from the example to create a controlWindow:

to add a slider I use: 

this property however does not work with a list box.

Thanks in advance.