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Note
This topic is about classic commands.
There is a new way to define commands. See Modern commanding overview (preview).
A Ribbon command creates a reusable definition that can be referenced by ribbon control elements.
Ribbon command elements
The <CommandDefinition> element defines a command in the ribbon. The Id attribute specifies a unique identifier for the command that can be referenced by ribbon control elements by using the Command parameter.
A ribbon command defines three things:
Enable Rules: Specifies when a specific ribbon control is enabled.
Display Rules: Specifies when a specific ribbon element is visible.
Actions: Specifies what code executes when a ribbon control is used.
Important
All command definitions are downloaded to a user's computer so that they can be evaluated at run time. This means that a user without the privileges to see a particular control in the ribbon can use the browser View Source command, review the code, and determine that a control exists that isn't displayed to them.
See also
Customize commands and the ribbon
Use localized labels with Ribbons
Define Ribbon enable rules
Troubleshoot ribbon issues