Removed some dead code

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25968 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Navigation bar added for euclidianview in a different way. (etc. it doesn't hide the context menu,...) (#3246)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25969 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Debug message removed... :)

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25970 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
More instanceof changes

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@25971 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e