MATLAB: Do I get an invalid interpreter on the annotation request

Question

TBox10=annotation('textbox',[.13,.39,.17,.085],'String', ...
{'\alpha\Beta\Gamma\delta\epsilon\zeta\eta\theta\iota\kappa', ...
'\Lambda\mu\nu\xi\pi\rho\sigma\tau\upsilon\phi\chi\psi\Omega'}, ...
'BackgroundColor',[.5,.5,1])
 TBox10 = 
TextBox (\alpha\Beta\Gamma\delta\epsilon\zeta\eta\theta\iota\kappa…) with properties:
             String: {2x1 cell}
           FontName: 'Helvetica'
           FontSize: 10
         FontWeight: 'normal'
              Color: [0 0 0]
    BackgroundColor: [0.5000 0.5000 1]
          EdgeColor: [0 0 0]
          LineStyle: '-'
          LineWidth: 0.5000
           Position: [0.1300 0.3900 0.1700 0.0850]
              Units: 'normalized'
Show all properties
 Warning: Error updating TextBox.
 String must have valid interpreter syntax:
\alpha\Beta\Gamma\delta\epsilon\zeta\eta\theta\iota\kappa
\Lambda\mu\nu\xi\pi\rho\sigma\tau\upsilon\phi\chi\psi\Omega

Answer 1

See http://www.mathworks.com/matlabcentral/answers/14751-greek-alphabet-and-latex-commands-not-a-question and notice the description of the grey shading

There is no \Beta just B and \beta