There was one piece of information missing in the source of this example: the grid columns configuration. I have added it in the comment, see it there.
See the comment here: https://learnfromsaki.com/ext-examples/#combo-in-grid
I'm a well seasoned developer, consultant and educator of web applications based mainly on Sencha libraries, PHP, MySQL and Node.js. Besides (Apple) computers, I love photography and mountain biking.
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