# File vtk/tk/vtkTkRenderWindowInteractor.rb, line 292
  def EnterEvent(event, ctrl, shift)
    if @FocusOnEnter
      _GrabFocus
    end
    @Iren.SetEventInformationFlipY(event.x, event.y, ctrl, shift,
                                   0.chr, 0, nil)
    @Iren.EnterEvent
  end