The following classes provide general support for ATL controls:
CComControl Consists of helper functions and data members that are essential to ATL controls.
IOleControlImpl Provides methods necessary for controls.
IOleObjectImpl Provides the principal methods through which a container communicates with a control. Manages the activation and deactivation of in-place controls.
IQuickActivateImpl Combines initialization into a single call to help containers avoid delays when loading controls.
IPointerInactiveImpl Provides minimal mouse interaction for an otherwise inactive control.