code: function( editor, dialogName, tabName ) {
  			var cfg = editor.config.removeDialogTabs;
  
  			return !( cfg && cfg.match( new RegExp( '(?:^|;)' + dialogName + ':' + tabName + '(?:$|;)', 'i' ) ) );
  		}
docs: Check whether tab wasn't removed by {@link CKEDITOR.config#removeDialogTabs}.
  
  @since 4.1
  @static
  @param {CKEDITOR.editor} editor
  @param {String} dialogName
  @param {String} tabName
  @returns {Boolean}