How do I get dragStart message sent?

[Michael D Mays]

I have a locked field with the following handlers:

on mouseDown
   set the dragdata ["text"] to me
end mouseDown

on dragStart
    beep
   pass dragStart
end dragStart

I never get a beep. In the Message Watcher I see
mouseDown
dragLeave
dragEnter
dragMove

What do I do to get the dragStart to be sent?

(What are the numbers in parentheses at the end of each line in the  
Message Watcher?
What are the messages types and are they handled differently?)

Thanks,
Michael