optical storage media often contain data structures for a menu suitable for selection of a title , a chapter , a parameter or others . such menus usually comprise a number of buttons to be displayed , with each button having a state . possible states of buttons are “ unselected ”, “ selected ” or “ activated ”. according to the invention , the representation of a menu button may vary , depending on its state . an image or an image sequence , e . g . cartoon , may be associated to a buttons state , providing user animation . further , a sound or sound sequence , e . g . melody or click , may be associated to a buttons state , and may be played back when the button enters this state . a data structure is disclosed which allows storage of such menu data e . g . on a blu - ray disc .