Checks whether a specified event handle is valid and the animation event has not yet completed.
HRESULT ValidateEvent( D3DXEVENTHANDLE hEvent );
Returns S_OK if the event handle is valid and the event has not yet completed.
Returns E_FAIL if the event handle is invalid and/or the event has completed.
The method will indicate that an event handle is valid even if the event is running but has not yet completed.
Header: Declared in D3dx9anim.h.