[vtkusers] how to place vtkImageTracerWidget

[Thiha Oo]

Hello,

  Please kindly help me with vtkImageTracerWidget.
  How can I position the vtkImageTracerWidget so that its projection
position is always in front of background image. (current seeing slice of
volume image)
  Sometimes, it was drawn in front of background image and sometimes it was
drawn behind the current viewing image slice.

Thanks,
Thiha
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