afterChangeProperties
fires after configuration attributes of the control have been changed dynamically
afterChangeProperties: (properties: object, id?: string) => void;
Parameters:
properties: object- an object with configuration attributes of the ToggleGroup or its separate options and their new valuesid: string- optional, the id of an option of the ToggleGroup
Example
form.getItem("toggleGroup").events.on("afterChangeProperties", function(properties) {
    console.log("afterChangeProperties", properties);
});
The properties object of the ToggleGroup control looks like:
{
    css: string,
    full: boolean,
    gap: number,
    height: string | number|"content",
    multiselection: boolean,
    options: object[],
    padding: string | number,
    width: string|number|"content"
}
The properties object object of a toggle of the ToggleGroup control looks like:
{
    full: boolean,
    icon: string,
    offIcon: string,
    offText: string,
    text: string,
    value: string | number
}
You will find the description of all these properties here.