private toggleBlockStyle: DraftStyleChangeHandler = ({ type: blockStyle, data }) => {
   const { content, onChange } = this.props;

   if (data) {
     const selection = content.getSelection();
     const nextContentState = Modifier.setBlockData(content.getCurrentContent(), selection, Map(data));
     const newEditorState = EditorState.push(content, nextContentState, 'change-block-data');

     return onChange(newEditorState, 'change-block-data');
   }

   onChange(
     RichUtils.toggleBlockType(
       content,
       blockStyle
     ),
     blockStyle
   );
 }