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Gets the theme color scheme index.
This value identifies which ThemeColor entry in the owning theme color scheme, such as Light1 or Accent1, the current theme color represents.
ThemeColor ThemeColorSchemeIndex { get; }
ReadOnly Property ThemeColorSchemeIndex As ThemeColor
ITheme theme = new Theme("CustomTheme");
IThemeColor themeColor = theme.ThemeColorScheme[ThemeColor.Accent1];
ThemeColor index = themeColor.ThemeColorSchemeIndex;