OLE custom controls – PB Docs 2021

The OLE control button in the Controls menu gives you the option of
inserting an object or a custom control in an OLE container. When you
select an OLE custom control (ActiveX control), you fix the container’s
type and contents. You cannot choose later to insert an object and you
cannot select a different custom control.

Each ActiveX control has its own properties, events, and functions.
Preventing the ActiveX control from being changed helps avoid errors later
in scripts that address the properties and methods of a particular ActiveX
control.