ClearLastMarker.C

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void ClearLastMarker()
{
        TObject *obj; if ( TVirtualPad::Pad() == NULL ) return;
   
        TIter next(TVirtualPad::Pad()->GetListOfPrimitives(),kIterBackward);
        while ( (obj = next()) ) { // look for markers
                if ( obj->InheritsFrom("TMarker") ) { delete obj; break; }
        }
        TVirtualPad::Pad()->Update();
}