Empty ctor
Creates a new group with some starting elements from a compatible range.
Adds a new RadioButton to the group.
Calls the onToggle delegate if set
Latches the group.
Latches to the given position.
Returns the current latch position.
Removes the given RadioButton from the group.
Returns the value of this group.
If set, it'll be called when the group is toggled.
Radio Button Group implementation. Can send events via it's delegates.