now I have implemented the logout functionality just by setting the AuthenticationToken == null in the code. which seems to work well when I quit the app.
But during sign in when I select the option "Keep me signed in " after setting the authentication token to null also I m able to login to my flickr account. I guess
when I select "Keep me signed in" the browser stores the values in cookies. Is there any way to delete the cookies so that I have a clean logout .. please suggest