Anyone know about Event Properties: OnActivate, OnDisable, ...?

[insomniac]

I somehow totally missed this thread till deathbane pointed it out to me on chat (chat btw, is very cool and more people should come play..anyway). OnHide="visible=true" is in my clock window and it rocks (thanks death!) I am still stuck on practial applications for this stuff, and a recap would be nice, its alot of stuff to go through.

when you do something like OnPress="Parent.HealthBar.Opacity=0.250" what says "healthbar" will do anything? is it the name= of the object? is there any shot of mapping this to a keyboard press instead of a button?