Fixed TreeItem stlyes that created a gap above Composite and complex widgets in Trees.

Patch by: jlabanca
Review by: ecc
Issue: 504



git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4376 8db76d5a-ed1c-0410-87a9-c151d255dfc7
7 files changed