How do I know if a CheckBox is checked or unchecked?

@JasonLee12345 wrote:

I know that you can use go.GraphObject.make to create a 'CheckBox' and usually people do '_doClick' call to execute some code. But if there is a way of getting the status of the current check box so that _doClick can do different logics?

${
    'CheckBox', 'check1', {
        '_doClick': (e, obj) => {
            if (this check box is checked?) {}
            else {}
        }
    }
}

So my problem is how to determine the current state of the checkbox as the if logic in the code. Is that possible that '_doClick' could be changed to 'checked' and 'unchecked' so that makes the developers more easier?

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