How to replace standard XtraRichEdit command with your own custom command

This example illustrates the technique used to modify the functionality of existing XtraRichEdit commands.
The RichEditControl exposes the IRichEditCommandFactoryService interface that enables you to substitute default command with your own custom command.
First, create a command class, inherited from the command that you've decided to replace. Override its methods. The main functionality and command specifics is located in the Execute or the ExecuteCore method (the latter does not check for the command availability).
Then, create a class implementing the IRichEditCommandFactoryService. You should override the CreateCommand method to create an instance of a custom command class if an identifier of a certain command is passed as a parameter. So, instead of the default command, a custom command will be used by the RichEditControl.
Finally we use this class to substitute the default RichEditControl's service.