tree.xml: bug 178604, 156454, 194876, 195393, 202391 by neil, 192346 by kyle yuan, bug 192885, 156576, 202393 by jan.
remove the tree constructor, since the #ifdef can be move the pageUpOrDownMovesSelection property definition.
git-svn-id: svn://10.0.0.236/trunk@146130 18797224-902f-48f8-a5cc-f745e15eee43