The Gauges Blockset graphical instruments are built with ActiveX controls. A generic ActiveX Control block lets you add an ActiveX control to your Simulink model. (This block can be configured only as a gauge. It does not support input controls.) You can make an ActiveX control available as a Simulink gauge block by specifying the name under which the ActiveX control is registered on your system, the events that cause the ActiveX control to perform an action, and the resulting action.