code: function(sCategory) {
          var filtersArray = this._categoryFilters;
          // Don't do anything if category is already enabled
          // Use Array.indexOf if available...
          if(filtersArray.indexOf) {
               if(filtersArray.indexOf(sCategory) >  -1) {
                  return;
              }
          }
          // ...or do it the old-fashioned way
          else {
              for(var i=0; i<filtersArray.length; i++) {
                 if(filtersArray[i] === sCategory){
                      return;
                  }
              }
          }
  
          this._categoryFilters.push(sCategory);
          this._filterLogs();
          var elCheckbox = this.getCheckbox(sCategory);
          if(elCheckbox) {
              elCheckbox.checked = true;
          }
      }
docs: Shows log messages associated with given category.
  
  @method showCategory
  @param {String} Category name.