Add tip about Popup base class inheritance to XAML popup docs

[Copilot]

The "Building a Popup in XAML" section tells users to create a ContentView but doesn't mention that advanced scenarios require inheriting from CommunityToolkit.Maui.Views.Popup or Popup<T> in the code-behind — leading to runtime errors for users following the docs.

• Added a [!TIP] callout after the XAML example linking to the Popup - Returning a result page, which demonstrates the required inheritance pattern

Original prompt

---

This section details on the original issue you should resolve

<issue_title>"Building a Popup in XAML" Missing important information</issue_title>
<issue_description>### Type of issue

Missing information

Description

[Enter feedback here]You didn't mention that if you choose to use a xaml as a popup you need to make sure the xaml.cs inherits from CommunityTookKit.Maui.Views.PopUp. This will throw an error when you call it. I know that the information is available in the docs but if users need to get the concept first, and are coming here to try it for the first time, it can be frustrating.

Page URL

https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/views/popup

Content source URL

https://github.com/MicrosoftDocs/CommunityToolkit/blob/main/docs/maui/views/Popup.md

Document Version Independent Id

c6126a74-78aa-2c4f-ce92-2cda527ca9fd

Platform Id

6de6bfab-e40a-2d12-6b54-92ba9ca262d2

Article author

@bijington

Metadata

• ID: c6126a74-78aa-2c4f-ce92-2cda527ca9fd
• PlatformId: 6de6bfab-e40a-2d12-6b54-92ba9ca262d2
• Service: dotnet-communitytoolkit
• Sub-service: dotnet-maui-community-toolkit</issue_description>

Comments on the Issue (you are @copilot in this section)

@bijington Would it be better if we link to this example that does highlight that detail?

https://learn.microsoft.com/en-us/dotnet/communitytoolkit/maui/views/popup/popup-result</comment_new>

• Fixes "Building a Popup in XAML" Missing important information #573

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File	Status	Preview URL	Details
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