It seems that the event OnItemMouseLeave is never fired...
TAdvSmoothCapacityBar version 184.108.40.206
(I can confirm that OnItemMouseEnter is corectly fired)
Ok, thank you
May I suggest to introduce a new event? OnItemBoundaryMouseOver
It should be fired when a mouse is (quite) over the boundary between two Items.
It could be used to allow the user to move that boundary with the mouse...
We'll consider this for a future update.