code: function() {
          // Initialize source filters
          this._sourceFilters = [];
          var aInitialSources = Logger.sources;
  
          for(var j=0; j < aInitialSources.length; j++) {
              var sSource = aInitialSources[j];
  
              // Add source to the internal array of filters
              this._sourceFilters.push(sSource);
  
              // Add checkbox element if UI is enabled
              if(this._elSourceFilters) {
                  this._createSourceCheckbox(sSource);
              }
          }
      }
docs: Initializes source filters.
  
  @method _initSources
  @private