Forgot to mention: this change resolves #25

I read through the code and it looks like it solves the problem at hand.

There are a couple of situations below that could cause unexpected behavior but I’m not sure it’s worth added complexity to resolve them.

Here are three (probably low probability) situations to consider:

• if the fill_color is changed while the button is selected, I think the color will be updated to fill color.
• if selected_color is changed while the button is selected, the color will not be updated
• when the button is first instanced, and selected_color is None, then the selected color is automatically selected. Do you want the same behavior if the the fill_color is updated and the selected_color was not defined?

Even with all these comments above, this PR resolves the key issue that it is trying to solve.

Great feedback thanks for having a look @kmatch98. Thank you @jposada202020 for trying it out!

I think you are right the colors will not get updated properly while the button is selected. I will work on a fix for both of those today.

I intended to leave the selected_color alone when updating the fill_color. I thought it might make it confusing if user was trying to set a different specific selected_color and fill_color but did them "out of order" and wound up overwriting their own selected_color with the new inverse.

I think it would be great to expose an easy way for user code to set selected_color to the inverse in the same way it does if initialized as None. This way the user can easily specify that the want to do that with their new fill_color, but it won't happen "silently".

Or if it was a setter function instead of a property it could accept a default argument to control the automatic inverse -> selected_color behavior?

Read through changes but did not verify on hardware.

Good updates to the color setters to eliminate the unexpected behavior when selected or unselected. Looks good to me.

Thank you both for looking into it. Going to merge this one to get ready for some other updates that will work with things in the new Layouts library better.