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Clarify SystemBackdropElement theme update behavior in sample UI#2186

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copilot/system-backdrop-element-theme-inheritance
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Clarify SystemBackdropElement theme update behavior in sample UI#2186
Copilot wants to merge 3 commits into
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copilot/system-backdrop-element-theme-inheritance

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Copilot AI commented May 29, 2026 •
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The SystemBackdropElement sample could imply that backdrop material reacts to control-level theme toggles. This update adds explicit guidance that material refresh follows app/OS theme transitions, which matches current platform behavior.

  • What changed

    • Added a one-line explanatory note directly below the SystemBackdropElement sample in SystemBackdropElementPage.xaml.

  • Why this helps

    • Sets correct expectations for users experimenting with theme changes in the sample.
    • Reduces ambiguity called out in the issue discussion around theme inheritance behavior.

  • Snippet

    <TextBlock
    Margin="0,12,0,0"
    Text="Theme updates for SystemBackdropElement are triggered by app or OS theme changes, not by setting theme directly on the control."
    TextWrapping="WrapWholeWords" />

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Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

  • 0t3vsblobprodcus362.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • 1k9vsblobprodcus379.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • 4zjvsblobprodcus390.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • 51yvsblobprodcus36.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • e7bvsblobprodcus348.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet restore WinUIGallery.slnx (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • gbsvsblobprodcus365.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • i1qvsblobprodcus353.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • kmuvsblobprodcus389.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • ljcvsblobprodcus317.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • mfjvsblobprodcus373.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • pc2vsblobprodcus360.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • pdfvsblobprodcus380.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • pe4vsblobprodcus351.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • s8mvsblobprodcus38.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • vb4vsblobprodcus33.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • x3yvsblobprodcus370.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • xupvsblobprodcus332.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)
  • yluvsblobprodcus367.vsblob.vsassets.io
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true (dns block)
    • Triggering command: /usr/bin/dotnet dotnet test /home/REDACTED/work/WinUI-Gallery/WinUI-Gallery/tests/WinUIGallery.UnitTests/WinUIGallery.UnitTests.csproj -p:EnableWindowsTargeting=true --filter FullyQualifiedName~SystemBackdropElement (dns block)

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Copilot AI linked an issue May 29, 2026 that may be closed by this pull request
SystemBackdropElement Theme Inheritence #2166
Open
Copilot AI changed the title [WIP] Fix theme inheritance for SystemBackdropElement in WinUI 3 Gallery Clarify SystemBackdropElement theme update behavior in sample UI May 29, 2026
Copilot AI requested a review from niels9001 May 29, 2026 12:34
@Jay-o-Way
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Jay-o-Way commented May 29, 2026

not by setting theme directly on the control.

Or a parent control 🤓

@niels9001 niels9001 marked this pull request as ready for review May 29, 2026 22:21
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SystemBackdropElement Theme Inheritence

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