Not able to set backdrop

[misakieku]

Describe the bug

Not able to set the bacdrop using ApplicationThemeManager.Apply(CurrentTheme, CurrentBackdrop);

To Reproduce

ApplicationThemeManager.Apply(CurrentTheme, CurrentBackdrop);

Expected behavior

Backdrop change

Screenshots

No response

OS version

windows 11

.NET version

.Net 8

WPF-UI NuGet version

3.0.4

Additional context

No response