Revision 40956

The following macro did not show the x-axis in TimeDisplay mode.The 
mg->GetYaxis()->UnZoom(); command erased the Time attribute of the axis.
 
{ 
TMultiGraph* mg = new TMultiGraph; 
TGraph* g = new TGraph; 
for (int i = 0; i < 100; i++) g->SetPoint(i, 1289420808+i, i+2); 
mg->Add(g, "P"); 
mg->Draw("AP"); 
mg->GetXaxis()->SetTimeDisplay(1); 
mg->GetYaxis()->UnZoom(); 
gPad->Modified(); 
gPad->Update(); 
}