Wrong placement of CommandBar using Page's TopAppBar property.

[jcz0389]

Describe the bug

The CommandBar is placed at the top of the window, rather than at the top of a specific Page.

Steps to reproduce the bug

1. create two rows' grid in app window
2. place a frame in second row
3. create a page with CommandBar in page's TopAppBar prop
4. show this page in the frame
5. observe where CommandBar is displayed

Expected behavior

CommandBar should be placed at the top of the page, not the window.

Screenshots

NuGet package version

None

Windows version

No response

Additional context

No response

[github-actions]

Hi I'm an AI powered bot that finds similar issues based off the issue title.

Please view the issues below to see if they solve your problem, and if the issue describes your problem please consider closing this one. Thank you!

Open similar issues:

• [WinUI][.NET 8] The in-app toolbar is in the wrong position (#8602), similarity score: 0.73
• CommandBar not respecting Fluent sizing (#9260), similarity score: 0.70

Closed similar issues:

• CommandBar appears above NavigationView (#2970), similarity score: 0.81
• CommandBar placed in Page.BottomAppBar does not move when window is resized (#8378), similarity score: 0.78
• CommandBar near top of window opens up, causes clipping (#1024), similarity score: 0.73

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[jcz0389]

This is the same cause as in #2970. In my app CommandBar is placed over "Click Me!" button and it is impossible to click the button.

[brabebhin]

I think the TopAppBar has been deprecated since windows 10 uwp. It's there to prevent compiler errors. Iirc TopAppBar was one of the key elements of the metro design language that simply forced apps to have a top and a bottom app bar, and used system defined rendering for that. It was replaced by the CommandBar cause nobody really wanted the inflexible behaviour of windows 8 metro app bars. I'm surprised it has any effect at all.