[vtkusers] unfreed memory?

[Luca Picello]

hello vtkusers.
i've gotta problem!!
i created a very easy application (in attachment) to test memory 
allocated by vtk objects.
I have a button where I create and put on renderwindow a list of spheres...
and another button where I do call the Delete() method.
What i see is that at the beginning the application is 19MB
then I add the items. (many megabytes)
when I delete all the application memory is 22MB!!!

ok, i'm with (censored) windowsxp but... are there any known bug???
please tell me,

thank you,
luca

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