Widget definitions, or, control definitions in Sitefinity CMS are a developer concept that enables building structured declarative user interfaces. They facilitate reuse of components when building the backend user interface (UI) and also enable third-party developers to plug their own components to extend that UI. For more information about definitions, see For developers: Build the backend UI with Control definitions.
Each widget definition consists of views for the backend and the frontend that represent a specific UI, for example for actions like Edit, Insert, View Preview, and so on. In some cases, you need to extend the default functionality the UI views for the needs of a more complex scenario. To do that, you need to replace the default view with your custom one through the widget definitions.
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