This is an enhancement of Matlab's hidden and unsupported addlistener function (within the uitools folder). It attaches a listener callback to one or more property (or properties) get or set event(s).
Acceptable events are PreGet, PreSet, PostGet and PostSet, which are triggered immediately before/after a get/set event on a handle property value.
See more extensive help section within.
Note: relies on undocumented and unsupported Matlab functionality. Use at your own risk. Comments welcome