One of Owen's comments in the topic Fred has linked to seems to suggest that you can leave out the 'c:' prefix for event handlers. This would prevent the event name from being included in the autocomplete list. But somehow this is not possible if event invoke = 1 (BricsCAD V14).
Event invoke = 1.
With the 'c:' prefix the event is sent as "(c:ModeLessTest/Form1/TextButton1#OnClicked)".
Which seems to confirm that the 'c:' prefix can be removed.
But if I remove it there is an error:
'Unable to recognize command "MODELESSTEST/FORM1/TEXTBUTTON1#ONCLICKED". Please try again.'
With event invoke = 0 the 'c:' prefix can be removed.