bool preparingScheme = false;

		Attribute SetAttribute (Attribute attribute, [CallerMemberName] string callerMemberName = null)
		{
			if (!Application._initialized && !preparingScheme)
				return attribute;

			if (preparingScheme)
				return attribute;

			preparingScheme = true;

			switch (caller) {
			case "TopLevel":
				switch (callerMemberName) {
				case "Normal":
					HotNormal = Application.Driver.MakeAttribute (HotNormal.Foreground, attribute.Background);
					break;
				case "Focus":
					HotFocus = Application.Driver.MakeAttribute (HotFocus.Foreground, attribute.Background);
					break;
....
			}
			preparingScheme = false;
			return attribute;
		}