code: function _getFrameFlag(frame, options, name) {
    var flag = '@' + name;
    return (flag in frame) ? frame[flag][0] : options[name];
  }
docs: Gets the frame flag value for the given flag name.
  
  @param frame the frame.
  @param options the framing options.
  @param name the flag name.
  
  @return the flag value.