This example shows how to create a modal confirmation screen by using the AlternateRoot feature.
The basic concept is to declare where you'd like to add a modal child. In this example we declare the FullWindow panel that occupies the full screen space of the app. Then we attach it to a resource named the same using ResourceObject.
On the OtherPage.ux the AlternateRoot has a ParentNode="{Resource FullWindow}". This says the child of this AlternateRoot will become children of the FullWindow panel. This allows us to keep our confirmation code local to where it's used, but place the actual UI elsewhere in the tree.