Hello,
Would you please provide us the whole codes to reproduce this issue,
You can upload your project to SkyDrive
http://skydrive.live.com/
It is not necessary that you send out the whole of your project. We just need a simplest sample to reproduce the problem. You can remove any confidential information or business details from it.
Best regards,
Jesse
Jesse Jiang
MSDN Community Support | Feedback to us
Develop and promote your apps in Windows Store
Please remember to mark the replies as answers if they help and unmark them if they provide no help.