- The fix done in the revision 20433 was not completely right: the multigraph   limits need to be initialisezd with call to ComputeRange on the 1st graph   before looping on the remaining graphs.
- The fix done in the revision 20433 was not completely right: the multigraph
  limits need to be initialisezd with call to ComputeRange on the 1st graph
  before looping on the remaining graphs.


git-svn-id: ecbadac9c76e8cf640a0bca86f6bd796c98521e3@21573 27541ba8-7e3a-0410-8455-c3a389f83636

dawehner/root,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,bbannier/ROOT,dawehner/root,bbannier/ROOT,dawehner/root,dawehner/root,dawehner/root