Warning: Unable to interpret LaTeX string "\ alpha"
> In openfig at 135
In gui_mainfcn> local_openfig at 286
In gui_mainfcn at 234
In GUI_prova2 at 42
...What should I do to see the Greek letter alpha in the static text?
Well, I built a new GUI w/ just a single uicontrol and voila! was able to reproduce your error.
The problem is that for LaTeX the string '\alpha' must be in the math environment it turns out (enclosed in '$' signs. Otherwise, it's attempted to be interpreted in text mode and that fails spectacularly. Set the text in the Property Inspector to
This is a Greek alpha: $\alpha$
and joy will ensue...
Whew....learned something about LaTeX...