XCheck, or eXclusive Check is a widget similar in function to Check, yet it supposed to be grouped in exclusive-selection groups. It is commonly known as Radio button in other GUI toolkits.
Source docs
The XOR-selection is accomplished by using the group property, passing the XCheck an instance of XorSelector. Additionally, DefaultOption may be used to mark the default-selected option within a group.
Example:
XorSelector grp;
DefaultOption = XCheck().text("option 1").group(grp);
XCheck().text("option 2").group(grp);
XCheck().text("option 3").group(grp);
int selected = grp.index;
