How does the vtkplanewidget set the size of the arrow and control handle(the sphere)?

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There are no interface to control size of handles , only change the source code and rebuild vtk .
But in python wrappers, it provide
// plane_widget->SetTubing(false);
// plane_widget->SetOutlineTranslation(true);
// plane_widget->SetOriginTranslation(true);
// plane_widget->SetDrawPlane(false);
I don’t know why . I am finding it out.

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thank you very much. we can give suggestion to the vtk org.