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[sjfp]

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);
 });
});

Thanks you. I will give it a try when i get a chance to log onto site again.