WorksheetGUI for Windows

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27418 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Typo in WinLAF

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27419 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for http://www.geogebra.org/forum/viewtopic.php?f=8&t=32561

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@27420 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e