Custom XML Menu Button Event Handling
A click bar button has event handling in the form of:
(for something like https://www.youtube.com/watch?v=PsAIukHgWgo)
and
(for things like viewtopic.php?f=27&t=6593 and includes changing targets on mouseover as well as modifiers on different clicks)
It appears that there may be some event handling that can be specified in the XML itself, but my search for how to setup the event handling has escaped me. For example, the custom XML templates by Lax and Mirai at viewtopic.php?f=44&t=3951 have placeholders for event handling even though the "noop" does nothing (http://www.lavishsoft.com/wiki/index.php/Command:NoOp).