To coordinate with the host's toolbox, ActiveX designers must support OLE drag and drop and implement the IDesignerToolbox interface. The following methods make up the interface:
| Method | Description |
| GetControlsInUse | Reports the ActiveX controls currently hosted on the designer. |
| IsSupported | Indicates whether the designer supports a particular ActiveX control. |
| ItemPicked | Reports that the user has picked an item in the toolbox. |