function isPaneToggled(parentIndex, indexOrKey) {
            var pane = lxSelect.choicesViewSize === 'large' ? lxSelect.panes[parentIndex] : lxSelect.openedPanes[parentIndex];

            if (angular.isUndefined(pane)) {
                return false;
            }

            var key = indexOrKey;
            if (angular.isObject(pane) && angular.isNumber(indexOrKey)) {
                key = (Object.keys(pane) || [])[indexOrKey];
            }

            return angular.isDefined(toggledPanes[parentIndex]) && toggledPanes[parentIndex].key === key;
        }
Check if a pane is toggled.

@param  {number}        parentIndex The parent index of the pane in which to check.
@param  {number|string} indexOrKey  The index or the name of the pane to check.
@return {boolean}       If the pane is toggled or not.