Missing event after selection of nodes are changed

[AlexSTHfg]

Hi,
is there a event or a trigger for me to detect, that the selection of a VST is changed?
Multiselect is true, it is possible to select more than one node by mouse or by SHIFT/CTRL key.
But I don't find a way to get a event or information, that selection is changed.
Is it possible to add this event or is there another way?

[AlexSTHfg]

I use now OnChange Event, it works for me. Hope this is correct to use this