Error :UI engine accessed without holding the event lock.

http://rob.wemakewebsites.co.nz/index.php?p=39

http://www.blackberry.com/knowledgecenterpublic/livelink.exe/fetch/2000/348583/800332/800505/800608/How_to_-_Manage_UI_interactions.html?nodeid=800514&vernum=0