Class Blueprint Creation tabs

I think UE 4 it is a more than fantastic program, but as the say says but in reverse, sometimes the fores doesn’t allow us to see the threes.
I made a simple “mistake” an while in blueprint creation I closed the graph Editor tab, and for the life of mine, I just can’t find the way to open it back, I reseated the interface and the program a couple of times, I can just get tired and delete that Class Blueprint and try to create it new from scratch, but that won’t be a real solution Didn’t it`?
How can I put it back?

All avable windows for specific editor is in “Window” menu, you can turn on and off any window (which can be tabed) of specific editor

Nope, that it is like that in the UE 4 main aplication, but if you fire up and create a new class blueprint, then you have the
main interface for that need, i mean the one that has three tabs, Viewport, Construction Script and Event Graph, if you close any of those two last you cannot open them from the window menu inside that application. Viewprort it is there but Construction Graph and Event Graph are not.
I lost all the work (fortunatrely not too much) i was doing creating a class blueprint (I am an absolute nobie) because the only way I found to get all the tabs back was deleting the actual one and start anew.
Must be a solution for sure for that, bue as I said, for the life of mine I couldn’t find it