Box: check child size policy and throw exception on bad percent
Box: check child size policy and throw exception on bad percent

Ignore-this: 7d7042d6a039d4c6b8f0f8942633f468

darcs-hash:20110209064837-e018d-eb3c246959fa17c5fb9bfd095401e48243faaa04.gz

KommuSoft/vty-ui,ktvoelker/vty-ui