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The ids are not set at the time __init__ executes. The method on_kv_post is passed the base_widget,

Thank you for the concise explanation and helpful references. I could finally understand the basics

That was magic. Fixed my issue! I was a bit confused about weakrefs since I started learning Kivy a

Interesting…this works as well: def set_pos(self, *args): # on size change update drawing self.o_x,