I would have to say that the ETB is much nicer than the Z-height bar.

Gtkradiant 1.4.0
Or
Gtkradiant 1.5.0
but i recommend 1.4.0 for begginers 
(Plus the reson why you could not
find the answear to this question
here is because its a easy question ^^)
As Shaderman said: The thing you are looking for doesnât exist anymore in 1.5 since Shaderman made the ATB. However, you can copy the texture easily by Control + C and Control + V.
If you are only interested in the shaderâs name, try the Surface Inspector by pressing S.