You could find objects that do not inherit from DispatcherObject here. Such as DispatcherEventArgs, DispatcherExtensions, Dispatcher, etc.
Update:
The following figure shows some of the main classes in the framework of the WPF class hierarchy (not all classes are included), which is helpful for a comprehensive understanding of the class hierarchy. The Brushes class in PresentationCore does not use DispatcherObject. It Implements a set of predefined SolidColorBrush objects.
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