Get the button value of a widget of a radio button group or check box. Usually, different radio buttons (widgets) of a radio button group (field) have different values. The radio button group has a value (returned by getValue()) which is either "Off" or one of those values. The individual buttons (widgets) of a check box field can also have different export values. Different radio buttons (widgets) of a radio button group (field) can have the same value; in that case, the radio buttons are linked. The individual buttons of a check box field also can have the same value.

public string getButtonValue()