[vtkusers] How to make the outline actor for picking invisible?

[An Jiye]

Hi.

When I perform picking by vtkPropPicker, it will pick the outline filter
sometimes. I have checked the source code of vtkInteractorStyle and got that
there does exist this line:

this->OutlineActor->PickableOff();

But strangely, it can be picked.

So how can I make it invisible? I think it doesn't do some help in my
current application.

Any suggestion will be appreciated.

An Jiye