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                                This example shows how to modify the functionality of an existing PDF Viewer command.

                                The PDF Viewer exposes the IPdfViewerCommandFactoryService interface that enables you to substitute the default command with your own custom command.

                                Show Implementation Details
                                To accomplish this task:

                                - Create a custom command class (e.g., a CustomNextPageCommand class), inherited from the command that you wish to replace (e.g., PdfNextPageCommand). 
                                - Override the required method of the command.  The main functionality and command specifics is located in the Execute method.
                                - Create a class (e.g., CustomPdfViewerCommandFactoryService) implementing the IPdfViewerCommandFactoryService. 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 PdfViewer.
                                - Use the created class to substitute the default PdfViewer’s service.
                                Select file
                                • CustomNextPageCommand.cs
                                • CustomPdfViewerCommandFactoryService.cs
                                • Form1.cs
                                • Program.cs
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                                • C#
                                • VB.NET
                                Select version
                                • 15.2.5 - 17.2.7

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