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[admin]

Another solution is to put a masking element above the whole visualization page when object value is true.
Custom JavaScript:

Code:

$(function() {
  if (typeof grp != 'object') {
    return;
  }

  var mask = $('<div>')
    .css({
      'position': 'absolute',
      'top': 0,
      'bottom': 0,
      'left': 0,
      'right': 0,
      'background-color': '#000',
      'z-index': 99999,
    })
    .addClass('hide')
    .appendTo('body');

  grp.listen('1/1/1', function(object) {
    mask.toggleClass('hide', object.value != true);
  });
});