The ThemeResource extension allows you to load a resource from a currently applied DevExpress theme without specifying the theme name in xaml and reload the resource if a theme is changed. You can reference the resource in xaml as follows:
[XAML]<BorderBackground="{dxci:ThemeResource {dxt:FloatingContainerThemeKey ResourceKey=FloatingContainerBackground}}"/>
See Also:
KA18580 - How to modify DX themes in WPF
K18542 - How to implement the ThemeMananger theme support in custom controls
T128436 - How to use DevExpress themes in a WPF Application