Modify the Clear function according to the suggestions done here: http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=15819&p=68057#p68057
Modify the Clear function according to the suggestions done here:
http://root.cern.ch/phpBB3/viewtopic.php?f=3&t=15819&p=68057#p68057

This allow to reuse the TGraph2D after a Clear.


git-svn-id: acec3fd5b7ea1eb9e79d6329d318e8118ee2e14f@48216 27541ba8-7e3a-0410-8455-c3a389f83636

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