New added color in color.inc after theme is enabled not reflecting on theme settings page

Testing steps
1) Add color.inc to a custom theme and add few colors as color info.
2) Enable theme. visit theme settings page, modify color settings so that it's not the default settings and is custom. Save.
3) Add a new color to the color info in the theme's color.inc.
4) Visit theme settings page. The newly added color not reflecting on theme settings page.
5) After switching to default mode for color set and saving theme settings. Newly added color is reflecting but the order is not correct. Always appearing at the bottom.