Is additional parameters possible in call_back functions (attr,old,new)?

[Bryan]

You can use stdlib functools.partial to bake in extra parameters. See

Several buttons how to know which one is pressed?

I haven’t tried it myself, but in case event doesn’t have any information about sender, I guess you might try to use functools.partial to create a new event handler for each button with some fixed argument: from functools import partial def drawArea(event, name): … drawButton.on_click(partial(drawArea, name=name))

Also, in the future, please use code formatting so that the code is intelligible (either with the </> icon on the editing toolbar, or triple backtick ``` fences around the code blocks)