Styles: Vertical Alignment / Top, Monthly calendar script

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How do I adjust a Style to change "Vertical Aligment: Middle" to "Vertical Alignment: Top"?

I'm using Monthly calendar script. I want the daily date numbers to be vertically aligned to the top. I want to do that using the styles. I'm in Style Manager, I have Text Properties window open. If I highlight one text box I can see that it uses styles "par_style_Date" and "char_style_Date".

In "Text Properties" I can change one text box number to "vertical justify". But unless I am able to edit the style to vertically justify I will have to vertically justify each text box manually, one at a time. I want to avoid that.