These macros provide support for snap-in extensions.
Marks the beginning of the snap-in extension data class map for a Snap-In object.  | 
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Marks the beginning of the toolbar map for a Snap-In object.  | 
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Marks the end of the snap-in extension data class map for a Snap-In object.  | 
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Marks the end of the toolbar map for a Snap-In object.  | 
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Creates a data member for the data class of the snap-in extension.  | 
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Enters a snap-in extension data class into the snap-in extension data class map of the Snap-In object.  | 
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Declares the ID of the context menu used by the Snap-In object.  | 
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Enters a toolbar into the toolbar map of the Snap-In object.  |