[vtkusers] Set a fixed control point in vtk contour widget

[Gishara Indeewarie]

Hi all,

I am doing a contour widget in VTK according to the example below:

http://www.vtk.org/Wiki/VTK/Examples/Cxx/Widgets/ContourWidget

I want to make a certain control point as fixed, so the user can't drag it.
I want to do it for that particular point only.
I tried many methods, such as keypressactivationoff, draggableoff etc but
did not work out.
Is there any way to do this?

Thanks.
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