[vtkusers] How to get a certain actor and render

[Rockydut]

Assume there are many renders in the m_pRenderWindow (which is a type of
vtkWin32OpenGLRenderWindow). And the order of these renders is uncertainty.
For example, we name these renders render1, render2, render3......, the
order in pRenderWindow  maybe render2, render1, render3, also maybe render1,
render3, render2...
So, How can I get a certain render. I know there is a method named
GetFirstRender and GetNextRenderWindow in vtkRenderWindowCollection,
However, I'm not sure which render getting from GetNextRenderWindow is what
I want.
The same for the vtkActor. I can travel all the actor from
vtkActorCollection::GetNextActor. However, I'm not sure which actor is what
I want.
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