bool checkStyle = false;
bool checkColor = attribute.Selection.GetStringValue() == "Wood";
ConfigAttribute width = null;
if (!checkColor)
	return ""; // No need to continue
	
foreach (ConfigAttribute attr in config.Attributes)
{
	if (checkStyle && checkColor && width != null)
		break;
	if (attr.val_Name == "Width")
	{
		width = attr;
	}
	else if (attr.val_Name == "Style")
	{
		// Check the style
		if (attr.Selection.GetStringValue() == "Modern")
			checkStyle = true;
		else
			return ""; // No need to continue
	}
}
if (checkStyle && checkColor)
{
	// Clear the selection if less than 20
	if (width.Selection.HasValue && width.Selection.GetNumericalValue() < 20)
		width.Selection.Set(null, false);
}
return "";