Prompt Message Box in View

Hello, When using the MVP pattern, how should I display alerts or message boxes prompting the user for information? For example, the user clicks a button to add a new item and I prompt for the name. Where should this prompt happen? In the View class? In the Presenter? The presenter is where I have

Line 23: Unexpected element 'define-configuration-property'

i have created an application using gwt 2.0.4 . i am facing a problem . The details are following:- Loading inherited module 'com.google.gwt.user.User' Loading inherited module 'com.google.gwt.core.Core' Loading inherited module 'com.google.gwt.core.CompilerParameters'