setDate in jQuery UI DatePicker

When I use setDate with dateFormat : 'yy-mm', jQuery UI DatePicker shows today's date and not the date specified in setDate.

Example: http://jsfiddle.net/DBpJe/7981/ (edited from https://stackoverflow.com/a/2209104/5568549)


But with dateFormat : 'yy-mm-dd' it shows the date specified in setDate. Example: http://jsfiddle.net/DBpJe/7982/

How to make jQuery UI DatePicker shows the date specified in setDate with dateFormat : 'yy-mm' ?