SetFunction
void SetFunction(Function* function);
void SetFunction(FunctionInstance* function);
void SetFunction(FunctionInstance* function);
fImageFunctionsView->SetFunction(fActiveFunction);
frame->SetFunction(function);
SetFunction(NULL);
instance->SetFunction(function);
instance->SetFunction(function);
instance->SetFunction(NULL);
instance->SetFunction(NULL);
SetFunction(NULL);