[Catalyst] TabBarBackgroundColor, TabBarUnselectedColor, and IsEnabled Not Working as Expected in Shell

[NafeelaNazhir]

Description

In a .NET MAUI Shell TabBar, several properties do not behave as expected. While TabBarBackgroundColor is not applied, TabBarUnselectedColor only affects the tab title text and not the tab icons. Additionally, setting IsEnabled="False" on a Tab does not disable the tab.

Expected Output	Actual Output
Screen.Recording.2025-12-15.at.3.17.19.PM.mov	Screen.Recording.2025-12-15.at.12.18.43.PM.mov

Steps to Reproduce

1. Create a Shell page with a TabBar.
2. Set TabBarBackgroundColor and TabBarUnselectedColor on the Shell.
3. Add multiple Tab items with icons.
4. Set IsEnabled="False" on one of the tabs.
5. Run the application.

Expected Behavior

• TabBarBackgroundColor should apply to the TabBar
• TabBarUnselectedColor should apply to both tab titles and tab icons.
• Tabs with IsEnabled="False" should be disabled and not selectable.

Link to public reproduction project repository

https://github.com/NafeelaNazhir/maui/tree/shell_TabBarIssue/src/Controls/tests/TestCases.HostApp/FeatureMatrix/Shell

Version with bug

10.0.20

Is this a regression from previous behavior?

Not sure, did not test other versions

Last version that worked well

No response

Affected platforms

macOS

Affected platform versions

No response

Did you find any workaround?

No response

Relevant log output

[Ahamed-Ali]

This issue has been validated in Visual Studio Code 1.107.0 using the HostApp with the latest .NET MAUI source. It can be reproduced on the macOS platform.

Before the fix in #32972 , the TabBar was invisible, so it could not be validated. After the fix, now the TabBar is visible but some other properties mentioned in the issue report are not working as expected.

related one in iOS - #32125