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RibbonWindow fails to correctly render if ThemeMode="System" is in either App.xaml or MainWindow.xaml. RibbonWindow and Ribbon are well written but seem to have missed the modernization in dotnet 9.
Reproduction Steps
Any valid RibbonWindow fails to render the quick access toolbar in the window title bar in a net9.0-windows or net10.0-windows project if any ThemeMode is set. I'm currently testing with 10.0.100-preview.2.25164.34.
@dha125, the actual issue here is that Ribbon and associated controls are not styled according to Fluent. Currently we have the styles for controls in PresentationFramework assembly.
Description
RibbonWindow fails to correctly render if ThemeMode="System" is in either App.xaml or MainWindow.xaml. RibbonWindow and Ribbon are well written but seem to have missed the modernization in dotnet 9.
Reproduction Steps
Any valid RibbonWindow fails to render the quick access toolbar in the window title bar in a net9.0-windows or net10.0-windows project if any ThemeMode is set. I'm currently testing with 10.0.100-preview.2.25164.34.
<RibbonWindow x:Class="WpfRibbonApp.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:WpfRibbonApp"
mc:Ignorable="d"
Title="MainWindow" Height="450" Width="800"
ThemeMode="System">
Expected behavior
Quick access toolbar in the window title bar.

Actual behavior
See image in expected behavior.
Regression?
No response
Known Workarounds
No response
Impact
No response
Configuration
No response
Other information
No response
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