If True, ampersands in each item's text will be converted to an underline and when the mnemonic is entered by the user the corresponding item will become the new CheckedItem.
If False, ampersands in the text are not converted and the control does not respond to mnemonics.
Target Platforms: Windows 10, Windows 8.1, Windows 8, Windows 7, Windows Server 2012, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2