[vtkusers] Creating a new vtkDataSet object

[David E DeMarle]

vtkDataObject is the parent class of vtkDataSet.
http://www.vtk.org/doc/nightly/html/classvtkDataSet.html

If you are handed a vtkDataObject you can use SafeDownCast to check if it
happens to be a vtkDataSet, but you shouldn't expect to create the child by
by creating the parent. Try creating one of the concrete child classes of
vtkDataSet. vtkPolyData::New(), vtkImageData::New() etc.

.
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