A question about Qt and vtk

I get it

find_package(VTK COMPONENTS 
  CommonCore
  CommonDataModel
  CommonColor  # if forget this!!
  FiltersSources
  GUISupportQt
  InteractionStyle
  RenderingContextOpenGL2
  RenderingCore
  RenderingFreeType
  RenderingGL2PSOpenGL2
  RenderingOpenGL2
  GUISupportQt
  RenderingQt
  REQUIRED
)