VBox: fix bug where child region size is negative
VBox: fix bug where child region size is negative

Ignore-this: 85092a0ff14db42b84356f29e496d64d

darcs-hash:20091004210040-e018d-f2ef9144a5d81e8cdfe8060427ddd24cce61574a.gz

KommuSoft/vty-ui,ktvoelker/vty-ui