# File vtk/gtk/GtkGLExtVTKRenderWindowInteractor.rb, line 258
  def OnKeyRelease(wid, event)
??
    m = self.pointer
    ctrl, shift = _GetCtrlShift(event)
#    keycode, keysym = event.keyval, event.string
    keycode, keysym = event.keyval, nil
    key = 0.chr
    if keycode < 256
      key = keycode.chr
    end
    @Iren.SetEventInformationFlipY(m[0], m[1], ctrl, shift, key, 0, keysym)
    @Iren.KeyReleaseEvent
    return true
  end