Blueprint like Slate Nodes Creation

Hi everyone.

Is there any documentation/tutorial for creating editor plugins, that use widgets like the ones used in Blueprint editor?
I can’t even find a name of a widget class like:
SVerticalBox or SDockTab but for nodes e.g. SNode or something. Until now it seems like I need to reverse engineer this stuff from the source code, but even the code in the engine doesn’t really look like Slate UI tutorial code.
Maybe I’m missing something?