Adding Custom Controls dll to Visual Studio ToolBox

I have a custom control DLL. How can I add these custom controls to VS2008 tool box programatically?

How do I add controls to Toolbox in Visual Studio 2019?

The Toolbox window displays controls that you can add to Visual Studio projects. To open Toolbox, choose View > Toolbox from the menu bar, or press Ctrl+Alt+X. You can drag and drop different controls onto the surface of the designer you are using, and resize and position the controls.

How do I add controls to my Toolbox?

Right-click any control icon in the Toolbox, or an empty area on any page of the Toolbox. From the shortcut menu, select Additional Controls. From the Available Controls list, select the new controls. Choose OK.