I created MVVM application which is support themes and I created a menu in application menu of xamRibbon for changing theme by Commands. But it seems facing a problem whith Scenic them explaind belew:

In my scenario: when setting current them of application to scenic all things working good,though changing them from Scenic to any other theme by "ThemeManager.CurrentTheme" results all commands of buttons in ribbon reset to null and it sees they are binding to NO commands while none of the command methods such as CanExecute and Execute able to run similar to previous state and changing theme from Scenic to this theme.

Is it a bug in Scenic theme? or my fault ?

Any help would be greatly appreciated.