Your getting your programs mixed up here. Paint shop pro is a bitmap editing package like photoshop, this means you have greater control over things like flood filling as the image is made up of pixels which can all be individually edited. Illustrator is a vector drawing package which means that the information is held as a set of points or coordinates, enabling smooth shapes and curves no matter how far you zoom in. This means that fills don't work in exactly the same way as Paint shop pro. To make a fill, you must first make a shape to be filled - your can't simply fill the background with a colour. So if you want a colour which covers the whole background you must first make a large rectangle to fill. All shapes have two colours: (at the bottom of the toolbar) a stroke (or outline) colour, and a fill colour. These can be transparent, patterns, gradients, or flat colours. To change a colour click the shape you wish to fill, click the fill colour box, and select the colour you want from any of the colour/gradient/pattern palettes.
I hope this helps with your question ;-)
Nick Price
nick.price@misuk.net