One reason you might not want to use the wizard, is that it may be missing certain HTML elements. One example is adding a password input textbox. As of August 2019, the wizard doesn’t provide this option.
In the below example, we’re adding a textbox and button combo to initialize later on as a finder. We’re also adding a textbox for a user id, and a corresponding password. We’ll be adding these right before the row where the Post button is, on the OE Order Entry screen.