Slate TreeView Simple Sample

Is there any tutorial that shows using of TreeView Slate widget?
I have read Rama’s tutorial but i think it is a little bit coupled with its file structure and seems a little bit complicated.

I have seen Slate Widget Examples but i didn’t have any idea what FTestData structure is.
I wanna run simple example of tree view in UI. I have done Slate setup and now i can see simple buttons on screen.
I couldn’t recognize that TestData what structure could be have .

Can anyone explain me what should i do to this works?