How can I add a custom property to a widget?

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Hi, I’m using gtkmm4, I need to set a simple boolean value to a gtkmm button.
I found this example: c++ - glibmm/gtkmm custom property explanation/example request - Stack Overflow, but it requires for me to create a derived class which I don’t want.
I tried to understand if I can add a custom property to an existing widget class, but the documentation isn’t very helpfull: glibmm: Glib::ObjectBase Class Reference
Please refer me to an example of how to set a custom property to a widget, thx!

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You need to create a derived class.

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Thx for the quick reply

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