#3392 Headers are OK, addig row and column are OK, removing them is NOK yet.

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34224 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e
Fix for IE mouse events

git-svn-id: http://dev.geogebra.org/svn/trunk/geogebra@34225 23ce0884-8a58-47d3-bc5c-ddf1cd5b9f9e