[vtkusers] who know :vtkCellPicker->AddObserver

[weiwei_zc]

Hi all!
who know the usage of vtkCellPicker:
these two are the Member of vtkCellPicker ,who know the usage.
AddObserver(unsigned long event, vtkCommand *, float priority=0.0) 
AddObserver(const char *event, vtkCommand *, float priority=0.0) 

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