How does VisualizerWithEditing bound a KeyCallback?

Hi, guys

I try to get the picked point value from `VisualizerWithEditing`, But when I want to add a label name to the point I just picked, the process is blocked, I can't do anything until I quit the window. But I just want to picked a point and label it, not to label a point list.

And I found the class `VisualizerWithKeyCallback`, which has keycallback function but no get_picked_point. So how can I bound a keycallback for VisualizerWithEditing and do something I want? Anybody help? Thanks.

Best,
Mikoy Chinese