[Bug]: Default to MicaAlt

[cdock1029]

Describe the bug

Thanks for this library, I appreciate the work you do. I'm sure I'm using it wrong, not that it's really a bug, but I can't seem to have the initial first time the app loads have it default to MicaAlt backdrop instead of regular Mica. I have this in my OnLaunched:

 ThemeService
 .ConfigureElementTheme(ElementTheme.Default)
 .ConfigureBackdrop(BackdropType.MicaAlt, true)
 .Initialize(MainWindow);

I can change it with the combo box and then it loads correctly in subsequent app startup. Just not the first time.

Steps to reproduce the bug

Call ConfigureBackdrop in OnLaunched

NuGet package version

DevWinUI 9.1.0

[ghost1372]

Hi @cdock1029
Thank you for your report!

The issue has been fixed in this commit:
Fixed in 3349178

The fix will be included in the next release.

Just for your information, you don’t need to pass the second parameter since it’s enabled by default:

.ConfigureBackdrop(BackdropType.MicaAlt, true)
can simply be written as:
.ConfigureBackdrop(BackdropType.MicaAlt)

Also note that this option only applies once — when the app launches for the first time. After that, the configuration is saved and reloaded automatically.

If you want to change it every time (and as a workaround for your current situation), you can disable auto-save using:

ConfigureAutoSave(false)