function _handleNewRule() {
        var inlineEditor = MultiRangeInlineEditor.getFocusedMultiRangeInlineEditor();
        if (inlineEditor) {
            var handlerInfo = _.find(_newRuleHandlers, function (entry) {
                return entry.inlineEditor === inlineEditor;
            });
            if (handlerInfo) {
                handlerInfo.handler();
            }
        }
    }
@private
Handle the "new rule" menu item by dispatching it to the handler for the focused inline editor.