[Mark Sir Link]

I am only going with what scripthelp displays as the expected params, 3 strings

not sure what other string it could possibly want besides name, and I'm sure the reason this works isn't because it's what's expected, but instead because echoing objects tends to return object.name

Anyway, on closer look, I think the real issue here is you are throwing an event for mousedown when I assume that that event is thrown when the scroll buttons are pushed. You have the scroll bars disabled, so I think it would be a virtual impossibility to ever throw that event.