ON_NOTIFY : Comes from a child control to the parent. This macro goes in the parent's message map. ON_NOTIFY_REFLECT: Comes from a child control, but is "reflected" back to the child (by the parent) so the child can handle its own notification. This macro goes in the child's message map. ON_NOTIFY_REFLECT_EX: Same as previous, except that the handler function returns a BOOL, indicating whether or not the message should be routed on to parent classes for possible handlers. Note   that   the   reflected   message   is   handled   before   the   notification   message.    

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