What is Chatroom_Picker - a spinner, listview or listpicker ?
Does setting the selection of Chatroom_Picker always fire the AfterPicking event ? (With a spinner it may not...)
(post deleted by author)
And it does not work for the listpicker either.
You will need to duplicate some of your blocks in the AfterPicking event and put them in the Notifier AfterTextInput event.