[vtkusers] vtkBorderWidget and vtkSeedWidget in QVTKWidget

[Sam Raby]

I was trying to get a vtkBorderWidget example working:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/Interaction/ImageClip

The example works fine in VTK, however when I wanted to use QVTKWidget in
Qt the vtkBorderWidget instant never appeared; A month ago, I had the same
issue when I wanted to use vtkSeedWidget.

After a lot of hours and several cups of coffee :), I came across 2-3
online posts such as this one:

http://vtk.1045678.n5.nabble.com/Using-VTK-widgets-in-Qt-renderers-tt1250231.html#none

and found out the problem is trivial, and it is only because the object
goes out of scope and hence vtkSmartPointer destroys it. One solution, for
me, was not-to-use vtkSmartPointer in this case, and remember to delete the
pointer in the end.

Just wanted to write this email for other people in future. Correct me if I
am mistaking in the above explanations. Maybe there is a better solution
too.

-Sam
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