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private _applyChanges(changes: any): void {
  changes.forEachRemovedItem((record: KeyValueChangeRecord) => 
         this._setStyle(record.key, null));

  changes.forEachAddedItem(
        (record: KeyValueChangeRecord) => 
                 this._setStyle(record.key, record.currentValue));

  changes.forEachChangedItem(
        (record: KeyValueChangeRecord) => 
                 this._setStyle(record.key, record.currentValue));
}