refix-ZK-2466 : Reset the _shallSize flag after resize
refix B70-ZK-2468: Grid with frozen columns rendered incorrectly
Merge pull request #154 from DevChu/refix-ZK-2466

refix-ZK-2466 : Reset the _shallSize flag after resize
Merge pull request #155 from chunfuchang/B70-ZK-2468

refix B70-ZK-2468: Grid with frozen columns rendered incorrectly