[Paraview] vtkSMIntVectorProperty number of elements

[papa ndéné NDIAYE]

Hi, all
I have built a Toolbar plugin in paraview with a button that applies
extractblock filter to a multiblock dataset
so as to get all the blocks seperately in different objects in the pipeline
browser.

I achieve getting the number of blocks from the selected multiblock but I
don't know how to set the block indice
of an extract block filter after having it buit.

*
vtkSMProperty* property= [the pqPipelineSource resulting from
createFilter]->GetProperty("BlockIndices");

vtkSMIntVectorProperty * indices=
vtkSMIntVectorProperty::SafeDownCast(property);

*but *"indices->GetNumberOfElements();" *returns 0 while the
compositeTreeWidget displays the blocks' hierarchy.

how can I modify a vtkSMProperty within the code?

thanks in advance!
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