private void initializeDoctypeValues() {
    int index = 0;
    String doctype =
        HTMLContentProperties.getProperty(
            HTMLContentProperties.DOCUMENT_TYPE, getResource(), false);
    if (doctype != null) {
      /*
       * If item is already part of combo, select it. Otherwise, select
       * none.
       */
      index = fDocumentTypeIds.indexOf(doctype);
    }

    // set combobox
    index = index >= 0 ? index : 0;
    fDocumentTypeCombo.select(index);

    updateDoctypeText(index, doctype);
  }