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MSFS How to set COM_STBY_RADIO_SET (TCalc_004)

Hello I have downloaded the simconnect TCalc_004 example and am trying in vain to change the standby frequency. Can anyone help me?

Thats my code:

my_simconnect.MapClientEventToSimEvent((Enum)Form1.EVENTS.KEY_COM1SBset, "COM_STBY_RADIO_SET");
my_simconnect.TransmitClientEvent(0U, (Enum)Form1.EVENTS.KEY_COM1SBset, "&H12645", (Enum)Form1.NOTIFICATION_GROUPS.GROUP0, SIMCONNECT_EVENT_FLAG.GROUPID_IS_PRIORITY);

Derived from this:

my_simconnect.MapClientEventToSimEvent((Enum)Form1.EVENTS.KEY_CLOCK_HOURS_INC, "CLOCK_HOURS_INC");

Thank you very much.
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1. The aircraft must have a radio defined that supports a standby frequency. This is in the aircraft.cfg for FSX... dunno where it is with the circus... err MSFS.
2. Frequency entry is in BCD, not hex nor decimal.