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Gets or sets the theme font used by the font.
Use Major or Minor to follow the workbook theme font scheme, or None to use a non-theme font.
ThemeFont ThemeFont { get; set; }
Property ThemeFont As ThemeFont
IFont font = worksheet.Range["A1"].Font;
font.ThemeFont = ThemeFont.Major;
ThemeFont themeFont = font.ThemeFont;