Where exactly i can find code sample on how to createworkitem() using javascript ? 

i am having hard time in finding code sameple to call createworkitem() method inside a custom extension I am developing in ADO. 

i retrieved the WITclient but inside workitem i have a specialized work item template with couple of custom fields. i need to send XML into one of the custom field and that's where the problem is , I am unable to find any samples. kindly someone guide me.
