anchor.diff:                              table.id = table_id;
                               table.class = "properties_table";
   
  -                            var dataFields = getDataFields(group_id);
  -                            for(var j in dataFields){
  -                                var field_name;
  -                                var field_value= {};
  -                                for(var k in dataFields[j]){
  -                                    if(k=="name"){
  -                                        field_name = dataFields[j][k];
  -                                    }else
  -                                    {
  -                                      field_value[k] = dataFields[j][k];
  -                                    }
  -                                }
  -                                dataValidation[field_name] = field_value;
  +
  +                            if(target.data["Comment"] == undefined){
  +                               target.data["Comment"] = null;
  +                               vis.updateData([target]);
                               }
                               for (var i in target.data) {
                                   var variable_name = i;
  
positive.code:                       vis.updateData([target]);
                    };
                }
                function getDataFields(group_id) {
                    var schema = vis.dataSchema();
                    var nodeFields = schema.nodes;
                    var edgeFields = schema.edges;
  
                    if (group_id == "nodes") {
                        return nodeFields;
                    }
                    if (group_id == "edges") {
                        return edgeFields;
                    }
  
                }
  
  
negative.code:                                             col2.appendChild(url);
                                          } else {
                                              var input_text = document.createElement('input');
                                              createEditableElement(input_text, target, variable_name, variable_value,group_id);
                                              col2.appendChild(input_text);
                                          }
                                          break;
  