MSComm XonXOff Clarification

I'm trying to trap XOn and XOff characters in the receive buffer while sending data to a serial device using XOnXOff handshaking. However, when the MSComm control is configured for XOnXOff, no events are triggered when XOn or XOff characters are received. In this case, the handshaking appears automatically.

When the MSComm control is configured for "no handshaking", then I am able to trap the incoming XOn and XOff characters in the receive buffer.

Am I missing something here or is this the way in which the MSComm control is suppose to operate?