[MacRuby-devel] How do I add a background image in xcode4/macruby

Hi All - I'm new to MacRuby so please be gentle! I am trying to add a background image to my app. I drag an 'image view' over to the window, but none of the options in any of the utilities drawers allows me to specify an image (which is what seems I need to do - according to various youtube vids... although they are for the iphone). I'd also like to set a splash screen - again have watched youtube videos but they all seem to be for the iPhone (and so adding a 'Default.png' image and 'sleep 5' doesn't work). Any help appreciate - and sorry to be such a nube.