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I'm new to using Lyx and Miktex so maybe I'm missing something here. I meant that after installing the package through the manager and adding \usepackage{qtree} in the preamble, Lyx doesn't recognize the commands associated with the package when I try to add the code on the document.

Also, what ...

Hi, i"m using Lyx with Miktex and I'm interested in using the qtree package. I've installed it through the Miktex package manager, but I'm missing the next step to activate it in Lyx. I read somewhere that you need to add \usepackage{qtree} in the lyx preamble. Right now I am using a standard ...