[Zope] ZSQL not shown in list to add new method

Hello all, I am trying to install zsql methods in zope 2.13. After many retries i am able to install it using buildout. Now it is not shown in the add listbox to add new zsql methods. What is going wrong? Normally when it is installed using buildout, it should be available in the listbox to add new zsql method. Please give a solution for this. Thanks, CPKulkarni