This method sets a timer.
HRESULT SetTimer( IDispatch *pdispControl, UINT dMilliSecs, long *pTimerID );
NOERROR indicates success. If an error occurs, the appropriate HRESULT value is returned.
When the timer reaches 0, it fires a WM_TIMER message to the event sink. The control’s identifier is contained in the low-order word of the message’s wParam.