TObjArray *arrGUI=0x0; TTree *calPads=0x0; TTree *calPads2=0x0; AliTPCCalibViewerGUI *gui=0x0; AliTPCCalibViewerGUI *gui2=0x0; AliTPCCalibViewer *viewer=0x0; AliTPCCalibViewer *viewer2=0x0; startGUI(char *file=0x0){ if ( file ) { arrGUI=AliTPCCalibViewerGUI::ShowGUI(file); gui=((AliTPCCalibViewerGUI*)arrGUI->At(0)); gui2=((AliTPCCalibViewerGUI*)arrGUI->At(1)); viewer=gui->GetViewer(); viewer2=gui2->GetViewer(); calPads=viewer->GetTree(); calPads2=viewer2->GetTree(); } }