Adds a command button component that has a minimum width specified by the {@link LayoutStyle#getDefaultButtonWidth()}.
Although a JButton is expected, any JComponent is accepted to allow custom button component types.
@param button the component to add
@throws NullPointerException if {@code button} is {@code null}
Adds the specified button to this group.
@param button the button to add.
@see #removeButton(ItsNatComponent)
@see org.itsnat.comp.button.toggle.ItsNatButtonRadio#setItsNatButtonGroup(ItsNatButtonGroup)
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