Contains control add-ins that have been registered.
To register an add-in, you include it on the Control Add-ins page in Dynamics NAV. A control add-in is a Microsoft .NET Framework assembly that enables you to add custom functionality to the Dynamics NAV clients. After you have registered a control add-in, you can use it on Dynamics NAV pages. You select the control add-in from this window and add it to a field control on the page.