Hi all,

I need to stop a thread running in the background when the associated 
interface (i.e. main ipywidget) is closed or when the associated cell is 
deleted. Not doing so would lead to a bunch of zombie threads after a 
while. So my questions are:

Is there a way to be notified when the user click on close button of a 
ipywiget? 
I tried the 'observe' way but it doesn't seem to work - the callback is not 
called when I close the widget.

As a workaround, hiding the 'X' button could also be a solution cause I can 
provide my own 'close' button. 
Is it possible to hide the default X button?

Concerning the cells, is there a way to be notified when a specific cell is 
removed from the notebook? 

Thanks for your help,
Nicolas

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