I have discovered a bug that appears when a RadScheduleView is used with the ScheduleViewStyleSelector to style the appointments and the theme is changed.

Steps to reproduce:

1. Setup a WPF project.
2. Use implicit styles with a theme (e.g. Office_Black).
3. Create a possibility to change the theme on runtime (e.g. to Fluent). (https://docs.telerik.com/devtools/wpf/styling-and-appearance/how-to/styling-apperance-themes-runtime)
4. Create a dialog with a RadScheduleView that uses a custom ScheduleViewStyleSelector as AppointmentStyleSelector. (https://docs.telerik.com/devtools/wpf/controls/radscheduleview/styles-and-templates/appointment-style)
5. Create at least one appointment.
6. Start application.
7. Change theme at runtime.

Result: The "old" appearance of the appointments stays after changing the theme.

Expected behavior: The appearance of the appointments changes according to the new theme.

I have attached a solution with the described behavior and an image of the outcome.