LayoutPanel Collapse and Expand Events

[don]

I'm currently using @expand and @collapse events, but unfortunately they also trigger for non-collapse/expand events (like mouse over events). Also the expand/collapse events don't pass any info (e.g. event obj) to the callback function. I need a way to detect collapse and expand events exclusively, any suggestions?

[don]

UPDATE (resolved):
I was able to resolve by adding a "transitionend" event listener to the LayoutPanel.