Add-Ins in NAV 2009 where all about data binding a custom visual component through the Source Expression of the field to a data source – a variable on a page or a field in a table. Data for a an add-in would be transferred when the page updates and changed values from the add-in would be transferred back and saved when the page saves data. The add-in could influence a little, by triggering the OnControlAddIn Trigger or requesting saving of data through the Site.
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