Problem with encapsulated text in shaded node with tikz

Question

I'm working with the TikZ package and I noticed that even though I get a correct pdf file with this .tex file (found in this forum):

\documentclass{article} 
\usepackage{tikz}
\begin{document}
\tikzstyle{ball} = [circle,shading=ball, ball color=red!80!white, minimum size=1cm]
\begin{tikzpicture}
\node [style=ball] {blah blah};
\end{tikzpicture}
\end{document}

if for example I change the colour from red to blue and I open the pdf file, keeping open the first one, there isn't the expected colour background, but if I close both the files and I open one of them the first one is correctly visualized, whereas the second is not...

Could someone tell me the reason of this problem?... and how to solve it...

Thanks in advance

PS: I'm working with MiKTeX and TeXnicCenter on Windows

Answer 1

You could use LaTeX instead of pdfLaTeX. Specifically, compile to DVI, convert to PS using dvips and then to pdf using ps2pdf. TikZ works this way as well.

When I tried that, I got the ball shading also with the Adobe Reader, in contrary to the pdfLaTeX way.