BUG: adding tk update to match rtImageTest.tcl implementation.
BUG: adding tk update to match rtImageTest.tcl implementation.

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