Add custom property to link dialog

Hey guys,

I need to have a custom property for my links on my editor that adds a data attribute to the links of a checkbox is checked. I have managed to add the checkbox by doing so:

var info = dialog.getContents("info");
info.elements.push({
                    "type": "vbox",
                    "id": "urlOptions",
                    "children": [{
                        "type": "hbox",
                        "widths": ["100%"],
                        "children": [{
                            "id": "button",
                            "type": "checkbox",
                            "label": "Button"
                        }]
                    }]
                });

On dialog definition. However, I have no idea where to even start on how to add a custom attribute on a link if that checkbox is checked, and remove it if it is not. Are there any examples of something similar? How would I approach that problem?

Thanks a lot.