Up: BLOX.BRadioButton [Index]
Set up so that aReceiver is sent the aSymbol message (the name of a selector accepting at most two arguments) when the receiver is clicked. If the method accepts two arguments, the receiver is passed as the first parameter. If the method accepts one or two arguments, true is passed as the last parameter for interoperability with BToggle widgets.
Answer whether this widget is the selected one in its radio button group.
Answer whether this widget is the selected one in its radio button group. Setting this property to false for a group’s currently selected button unhighlights all the buttons in that group.