{ $class-description "A book is a control containing one or more children. The " { $link control-value } " is the index of exactly one child to be visible at any one time, the rest being hidden by having their " { $snippet "visible?" } " slots set to " { $link f } ". The sole visible child assumes the dimensions of the book gadget."
{ $description "Creates a " { $link book } " control, which contains the gadgets in " { $snippet "pages" } ". A book shows one child at a time, determined by the value of the model, which must be an integer " } ;
