What I actually was trying to do was to hide a label when the cursor leaves it. The point was to use this to hide the theme UI when not needed (more screen space == good).

ie. AllLabelOnLeave "!BarHideHandler" (custom MZScript bang)

I used XLabel in the place of LSBox so that I would gain access to those event routines and be able to pull this off.

It seems that in addition to XLabel pissing in my eye, anything else in the label blocks the actual label from responding, and if the cursor is on a taskbar, which is in a label, the OnEnter/OnLeave -clause never happens. I thought and thought, but couldn't come up with any workarounds.
Has anyone done somehing similiar to this?