This method dispatches a message from a container to a windowless control that is in-place active.
HRESULT OnWindowMessage( UINT msg, WPARAM WParam, LPARAM LParam, LRESULT plResultParam );
| Header file: | Atlctl.h | 
| Platforms: | |
| Versions: | Version 2.0 and later | 
| Complete documentation: | Visual C++ documentation | 
IOleInPlaceObjectWindowlessImpl Overview, IOleInPlaceObjectWindowlessImpl Methods, IOleInPlaceObjectWindowless::OnWindowMessage