Available for Check and Option objects.
Read/Write only at design time
Specifies whether a Check or Option object automatically highlights itself when it is selected by the user. It can be one of the following values:
TRUE The BS_AUTOCHECKBOX / BS_AUTORADIOBUTTON
style is added and the object is highlighted when selected (default).
FALSE The BS_AUTOCHECKBOX / BS_AUTORADIOBUTTON
style is removed and the object is not highlighted when selected.