class TGButtonGroup: public TGGroupFrame

 Constructor. Layout 1 row or 1 column.

 Constructor. Layout defined by TGMatrixLayout:
    r = number of rows
    c = number of columns
    s = interval between frames
    h = layout hints

 Default init.

 Destructor, we do not delete the buttons.

 Redraw the group frame. Need special DoRedraw() since we need to
 redraw with fBorderWidth=0.

 Draw border of around the group frame.

 if frame is kRaisedFrame  - a frame border is of "wall style",
 otherwise of "groove style".

 Makes border to be visible/invisible.

 Sets the button group to be exclusive if enable is kTRUE,
 or to be non-exclusive if enable is kFALSE.
 An exclusive button group switches off all other toggle buttons when
 one is switched on. This is ideal for groups of radio-buttons
 A non-exclusive group allow many buttons to be switched on at the same
 time. The default setting is kFALSE.

 If enable is kTRUE, this button group will treat radio buttons as
 mutually exclusive, and other buttons according to IsExclusive().
 This function is called automatically whenever a TGRadioButton
 is inserted, so you should normally never have to call it.

 Sets the state of all the buttons in the group to enable or disable.

 Sets the button with id to be on/down, and if this is an
 exclusive group, all other button in the group to be off/up.

 Inserts a button with the identifier id into the button group.
 Returns the button identifier.

 It is not necessary to manually insert buttons that have this button
 group as their parent widget. An exception is when you want custom
 identifiers instead of the default 1, 2, 3 etc.

 The button is assigned the identifier id or an automatically
 generated identifier.  It works as follows: If id > 0, this
 identifier is assigned.  If id == -1 (default), the identifier is
 equal to the number of buttons in the group+1.  If id is any other
 negative integer, for instance -2, a unique identifier (negative
 integer <= -2) is generated.

 Inserting several buttons with id = -1 assigns the identifiers 1,
 2, 3, etc.

 Removes a button from the button group.

 Finds and returns a pointer to the button with the specified
 identifier id. Returns null if the button was not found.

 Finds and returns the id of the button.
 Returns -1 if the button is not a member of this group.

 This slot is activated when one of the buttons in the group emits the
 Pressed() signal.

 This slot is activated when one of the buttons in the group emits the
 Released() signal.

 This slot is activated when one of the buttons in the group emits the
 Clicked() signal.

 This slot is activated when one of the buttons in the
 exclusive group emits the Pressed() signal.

 Show group of buttons.

 Hide group of buttons.

 Set or change title.

 Set or change title.

 Set layout hints for the specified button or if button=0 for all
 buttons.

 Save a button group widget as a C++ statement(s) on output stream out.