I am trying to achieve a box within another box in tikz and then drawing an edge from the inner box to an outer node. I stumbled upon this solution
When I compile it using pdflatex, I get the desired output(just like the answerer mentioned):

However, compiling with latex and subsequently with dvips and ps2pdf(or dvipdf), I get this:

I want to know what is causing this and can it be corrected, since I need to use latex and not pdflatex. Thanks in advance.
I need to use latex instead of pdflatex because I have to include .eps files into my document. Is there a way to convert .eps files to some other vector graphics format(not jpg, png or pdf) and then include them with pdflatex?
– user34812 Jun 25 '14 at 17:48epstopdfpackage in preamble (which will convert them to pdf on the fly) or convert them to pdf with some conversion utility. – Ignasi Jun 25 '14 at 18:43