creating image views at run-time

I’m converting a Hypercard stack to an ASS application. I want to have a window in which to display a set of images from a folder. As the number of images is variable depending on the folder I choose, I need to create image views at run time. I have achieved filling an image view from a file and positioning it in the window, but I can’t find any way of making a new image view and displaying it. It seems that I need to create all image views beforehand in the window’s NIB? Or what am I missing?