[vtkusers] Callback()

[Louis Desjardins]

Hello

I'm trying to understand the command/observer style

The vtkCallbackCommand class, derived from vtkCommand, has the method 
Execute() which calls a method Callback() (copied and pasted below):

void vtkCallbackCommand::Execute(vtkObject *caller, unsigned long event, 
void *callData)
{
  if (this->Callback)
    {
    this->Callback(caller, event, this->ClientData, callData);
    }
}


Can someone tell me where this Callback() function can be found?? I can't 
find its definition or anything

Thats it for now...

Thanks...

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