[vtkusers] Extending vtkImageImport and errors on callbacks

[Ali -]

Hi,

Assume myImageImport extends the class vtkImageImport and used in the 
following code:

myImageImport* imp = myImageImport::New();
imp->SetImportVoidPointer(...);

vtkImageMapToWindowLevelColors *mapToWL = 
vtkImageMapToWindowLevelColors::New();
mapToWL->SetInputConnection(importer->GetOutputPort());

vtkImageViewer2 *viewer = vtkImageViewer2::New();
viewer->SetInputConnection(mapToWL->GetOutputPort());

The last line calls vtkImageImport::InvokeUpdateInformationCallbacks() where 
'this' in the function body is NULL.

Do I need to override the callbacks when extending the corresponding class 
or am I missing something else?

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