For example, assume that I create a web-app to manage projects, and I want to allow my users to add files to a project. In that scenario, I would like to have the Picker available from the Edit page of each project. Currently, I need to add the URL of each project (e.g. http://www.myapp.com/Edit/1, http://www.myapp.com/Edit/2, etc.) in order to be able to invoke the Picker.
This makes it unusable, since each user in my app can open his own projects.