Wavelet 1-D for Harmonic Analysis

Hello everybody, So here is my problem, I have this grid I designed on simulink. And I want to measure its harmonic content. I was able to do this directly from the simulink using the FFT analysis. Now, I want to use the wavelet analysis for the same purpose, so I saved the output desired signal I want to study to the workspace, and I uploaded it to the wavelet menu (I typed in the workspace wavemenu and I got the wavelet menu ) I selected wavelet 1-D and I uploaded the signal but I don't know what to do next.

Again, my target is to study the harmonic content of the signal, so I would want to calculate the THD factor..

If anyone could be help, it would be great..

Thank you very much...