setButtonLabel sets the button label
 
    This method sets the label of specified buttons.
 
    'Buttons' Argument (required)
       The button or an array of buttons, e.g., [1 2] for b1 and b2
 
    'Labels' Argument (required)
       A string, or a cell array of strings specific for each button.
 
    Example
      % Set b1/b8 labels to start/stop
      mobileIO.setButtonLabel([1 8], {'start', 'stop'});