Ticket #3767: fixing problem with drag & drop

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30982 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Ticket #3767: for ability to switch to the spreadsheet toolbar (of not much use currently, as there are no tools in the spreadsheet toolbar yet)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@30983 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e