BUG: when columns of interest are changed, Modified() must be called.
BUG: when columns of interest are changed, Modified() must be called.

naucoin/VTKSlicerWidgets,jeffbaumes/jeffbaumes-vtk,candy7393/VTK,aashish24/VTK-old,candy7393/VTK,ashray/VTK-EVM,collects/VTK,mspark93/VTK,arnaudgelas/VTK,mspark93/VTK,ashray/VTK-EVM,johnkit/vtk-dev,keithroe/vtkoptix,Wuteyan/VTK,arnaudgelas/VTK,sankhesh/VTK,keithroe/vtkoptix,gram526/VTK,sumedhasingla/VTK,spthaolt/VTK,jmerkow/VTK,collects/VTK,demarle/VTK,SimVascular/VTK,spthaolt/VTK,aashish24/VTK-old,mspark93/VTK,daviddoria/PointGraphsPhase1,SimVascular/VTK,spthaolt/VTK,daviddoria/PointGraphsPhase1,jeffbaumes/jeffbaumes-vtk,SimVascular/VTK,johnkit/vtk-dev,naucoin/VTKSlicerWidgets,hendradarwin/VTK,sumedhasingla/VTK,hendradarwin/VTK,sankhesh/VTK,SimVascular/VTK,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,gram526/VTK,demarle/VTK,SimVascular/VTK,keithroe/vtkoptix,arnaudgelas/VTK,SimVascular/VTK,collects/VTK,gram526/VTK,berendkleinhaneveld/VTK,berendkleinhaneveld/VTK,candy7393/VTK,aashish24/VTK-old,daviddoria/PointGraphsPhase1,cjh1/VTK,collects/VTK,gram526/VTK,biddisco/VTK,ashray/VTK-EVM,sankhesh/VTK,Wuteyan/VTK,msmolens/VTK,msmolens/VTK,keithroe/vtkoptix,biddisco/VTK,gram526/VTK,sumedhasingla/VTK,sankhesh/VTK,jeffbaumes/jeffbaumes-vtk,johnkit/vtk-dev,daviddoria/PointGraphsPhase1,msmolens/VTK,ashray/VTK-EVM,Wuteyan/VTK,cjh1/VTK,msmolens/VTK,cjh1/VTK,SimVascular/VTK,candy7393/VTK,mspark93/VTK,demarle/VTK,arnaudgelas/VTK,sumedhasingla/VTK,sumedhasingla/VTK,candy7393/VTK,biddisco/VTK,jmerkow/VTK,mspark93/VTK,arnaudgelas/VTK,spthaolt/VTK,jmerkow/VTK,jmerkow/VTK,demarle/VTK,cjh1/VTK,candy7393/VTK,mspark93/VTK,gram526/VTK,sankhesh/VTK,keithroe/vtkoptix,hendradarwin/VTK,aashish24/VTK-old,jeffbaumes/jeffbaumes-vtk,Wuteyan/VTK,keithroe/vtkoptix,cjh1/VTK,johnkit/vtk-dev,Wuteyan/VTK,sumedhasingla/VTK,msmolens/VTK,johnkit/vtk-dev,sankhesh/VTK,jeffbaumes/jeffbaumes-vtk,hendradarwin/VTK,berendkleinhaneveld/VTK,collects/VTK,johnkit/vtk-dev,sankhesh/VTK,sankhesh/VTK,jmerkow/VTK,biddisco/VTK,biddisco/VTK,gram526/VTK,ashray/VTK-EVM,naucoin/VTKSlicerWidgets,sumedhasingla/VTK,demarle/VTK,SimVascular/VTK,gram526/VTK,daviddoria/PointGraphsPhase1,berendkleinhaneveld/VTK,keithroe/vtkoptix,mspark93/VTK,msmolens/VTK,biddisco/VTK,sumedhasingla/VTK,arnaudgelas/VTK,demarle/VTK,hendradarwin/VTK,demarle/VTK,hendradarwin/VTK,msmolens/VTK,aashish24/VTK-old,Wuteyan/VTK,berendkleinhaneveld/VTK,naucoin/VTKSlicerWidgets,ashray/VTK-EVM,berendkleinhaneveld/VTK,demarle/VTK,hendradarwin/VTK,msmolens/VTK,Wuteyan/VTK,johnkit/vtk-dev,jmerkow/VTK,aashish24/VTK-old,ashray/VTK-EVM,jmerkow/VTK,biddisco/VTK,spthaolt/VTK,naucoin/VTKSlicerWidgets,cjh1/VTK,mspark93/VTK,keithroe/vtkoptix,candy7393/VTK,jeffbaumes/jeffbaumes-vtk,collects/VTK,berendkleinhaneveld/VTK,jmerkow/VTK,daviddoria/PointGraphsPhase1,candy7393/VTK,spthaolt/VTK,spthaolt/VTK