I am sure that my answer will be down voted as non constructive but mixing pdfLaTeX, Beamer and PSTricks is a wrong thing to do. I am not saying that it can not be done I am saying it is wrong. Why?
Beamer is LaTeX presentation class based on TikZ/PGF library intended to be use with pdfLaTeX engine. PSTrick is a package which enables easy integration of PostScript language (page description language mostly used for graphics) with TeX engine via
process. While modern TeX distributions use pdfLaTeX engine the strong preference of PSTricks for above route remains. There is a LaTeX presentation class called Powerdot based on PSTricks.
Either pick up pdfLaTeX, Beamer, and TikZ/PGF or pick pdfLaTeX (tex->dvips->ps2pdf), Powerdot and PSTricks and stick with it (actually there are some other valid choices like
MetaPost, Asymptote, PythonTeX but that is another story).
I use almost exclusively Powerdot+PSTricks due to the simple fact that I started using TeX long before TikZ/PGF and Beamer existed. This is not a holy war. TikZ/PGF community is probably bigger and much more active but I could assure you that both tools could do the job. I actually like to experiment with PythonTeX