Usercontrol: if changed manually from a page or similar

[vsfeedback]

This issue has been moved from a ticket on Developer Community.

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[severity:It bothers me. A fix would be nice]
If a WPF UserControl or Page XAML file is missing its required .xaml.cs code-behind file, the build should fail with an error, not silently succeed. This causes hard-to-diagnose runtime issues.

the solution is built without errors and says no binding errors, but navigation silently fails, no errors or warning found.

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Original Comments

Feedback Bot on 9/8/2025, 09:53 AM:

We have directed your feedback to the appropriate engineering team for further evaluation. The team will review the feedback and notify you about the next steps.

[miloush]

.xaml.cs files are not required