I am trying to display a notice in admin panel when I activate my test plugin. How can I display that? What\'s that method?
You can use the new admin notices to create what are called admin pointers using show_wp_pointer_admin_bar.
show_wp_pointer_admin_bar
Linky: http://wpengineer.com/2272/how-to-add-and-deactivate-the-new-feature-pointer-in-wordpress-3-3/