As an example, consider:

@GUI::Widget {
	layout: @GUI::VerticalBoxLayout {
    }

    @GUI::RadioButton {
        text: "Space"
        autosize: true
    }

    @GUI::Widget {
        fixed_height: 25

        layout: @GUI::HorizontalBoxLayout {
        }

        @GUI::RadioButton {
            text: "Other: "
            autosize: true
        }

        @GUI::TextBox {
            text: ""
        }
    }
}

(p.s. it looks good with js syntax highlighting, just sayin')

The expected behaviour (visually, at least) is for the "Space" radio button to be unchecked when the "Other" one is checked, but since the second radio button has a widget parent, the two are not considered to be in the same group.

One way I can think of to make this work is to have some sort of "transparent" widget that is only used for grouping.

Image for reference: