You have your DC's definition, so why not use dcdefn.entities.add_cpoint(point) so that then it is part of the DC ??

Why ask me? You are the one with all of the code... Just test it. You need to call your method self.draw_beam() within the onMouseMove method - probably after you've test for a certain 'state' being reached - e.g. perhaps initially 'draw_beam' doesn't kick in with @state=0, but after you have done some other stuff when you've then set @state=1 - then in the onMouseMove method the line would be self.draw_beam() if @state==1 etc, later on, perhaps after you click again, you'd set @state=2 so then the 'draw_beam' stops...

I tested it and it is actually the good origin point which is returned by the .origin method. I need to call the method for the nested component as I decided another point for the container component's origin. And I will use a for loop to get the right subcomponent (with the right name). Thanks a lot ! Marie

Thank you TIG ! It works perfectly.