After much experimentation, I can get either the server to pull data into a working grid, OR I can display a Add New Row dialog box containing the data entry rows, but I can't do both.
I'm not sure what I'm missing, and the documentation isn't clear on this.
Ladies and Gentlemen, I am pleased to report that I figured out the solution to this problem.
The solution to adding fields to a Modal Box when Adding a New Row is to use the “editable” property to the ColModel that created the grid, as shown here:
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