How to create a radio Button in Dialiog

First create a new base enum with the property selected as radiobutton.

Dialog dialog = new Dialog();
DialogField df;
FormRadioControl frc;
;
df = dialog.addField(typeid(BaseEnum1));
frc = df.control();
frc.caption("Whatever the label should be");
frc.helpText("Whatever the help message should be");
dialog.run();