BEGIN_MESSAGE_MAP and END_MESSAGE_MAP
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These two macros enclose a block where the message handling for a component is defined.
class PACKAGE TDBCalendar : public TSampleCalendar
{
private:
void __fastcall CMExit(TWMNoParams Message);
BEGIN_MESSAGE_MAP
MESSAGE_HANDLER(CM_EXIT, TWMNoParams, CMExit)
END_MESSAGE_MAP
};