After you implement new widgets, you must register them in the Sitefinity CMS toolbox. You do this by decorating the widget controller class with the ControllerToolboxItem attribute. This attribute defines the following properties of the widget:
The unique developer name of the toolbox section, in which you add the widget. This can be an existing section name. To find out the names of existing sections, go to the ~/Sitefinity/Administration/Settings/Advanced/Toolboxes folder and expand the PageControls » Sections nodes. For example, you can add your new widget to the ContentToolboxSection, defined as the constant ToolboxesConfig.ContentToolboxSectionName.
You can also create a new section and Sitefinity CMS will automatically create toolbox section with the name you have specified.
IMPORTANT: Required when developing MVC form fields.
For more information about new widgets, see Create widgets.
For an example of how to implement a Content Block widget controller, take a look at the GitHub repository.
Sitefinity CMS automatically detects all widget controllers that are decorated with the ControllerToolboxItem attribute and adds the corresponding item to the widget toolbox.
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