Hello Lakshmi,

It has been a while since you have made your post, in case you still need support I will be glad to assist you further. I suppose the other community members can benefit from this answer as well. I have been looking into your post and I suggest you see this link:

http://www.c-sharpcorner.com/uploadfile/dpatra/sticky-notes-in-silverlight/

where it shown the functionality you want.

Feel free to write me if you have further questions.