[ENH] Improve the UI on single-object selector

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52030 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Initial default selection was lost

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52031 b456876b-0849-0410-b77d-98878d47e9d5