184.108.40.206.3.6 CNTRL Structure Describing a Button Control
dwType: Property that is used to perform an action. This value MUST be the PidTagAddressBookManageDistributionList property, as specified in [MS-OXOABK] section 220.127.116.11. If this value is anything else, it MUST be ignored.
ulSize: MUST be 0x00000000 and MUST be ignored.
ulString: String that contains the label text of the button control. The string MUST NOT be greater than 128 bytes in length, including the NULL-terminating character.