Usually, setting up the HTML Treegrid simply means pulling in the java script imports as shown in the that you receieve when you download the trial version. However, doing the same using sencha architect is also quite straightforward. In the attached document, there is a step by step process to get this setup. Please note, that in the trial version, you will get 3  versions of the htmltreegrid main javascript file. You need only one of them -  minified-compiled-ext.js when using the grid inside EXT JS. As always, feel free to contact us if you run into any issues.

How to create gridContainer with sencha architect.doc (1.34 mb)