adapt CVCenter:*use resp. *add for CVWidgetMS

Signed-off-by: nuss <st9fan@gmail.com>
bug hunting
if CVCenter.makeWindow gets called before any CVs have been added CVCenter.put will fail

Signed-off-by: nuss <st9fan@gmail.com>
bugfix
if CVCenter:*makeWindow has been called
and now widgets were present tabProperties got
redeclared in new as an empty array. Hence, no
next position was available.

Signed-off-by: nuss <st9fan@gmail.com>