[vtkusers] Delete points from vtkPolyData

[David Català Monter]

Hi everyone,
I use vtkPolyData class and I have to delete some points,
I use vtkPolyData.DeletePoint() or vtkPolyData.DeleteCell(),
but I have problems with memory.
How can I use  vtkCellArray and vtkPoints from vtkPolyData to delete Points?

Thanks,
David