Nets list is always empty in the Net property for pads (No Net) - HOW?

Question

There is a Net property for a pad in PcbLib. However the list of nets is always empty. Where PcbLib takes the list of nets from?

I need to assign holes' array beneath IC (a heat-sink) to GND in footprint.

olemi · Accepted Answer

Then the dialog should not be there when editing component in the lib, it's misleading. Also the doc says that there will be active nets listed, also misleading. I found by experiments that I should assign nothing, but just short the pad to a pin with the net to which it belongs and then the pad will be also linked to the same net during layout. I think I like this behavior, but dialog is still misleading.