How to change the color bar under fill/back color icon on toolbar and use last color setting

I created custom toolbar icons that look and function similar to the
standard MS Access Fill/Back Color and Fill/Fore Color toolbar icons.
My custom icons call a function that uses the Terry Kreft and Stephan
Lebans 'aDialogColor' function. I modified the function slightly to
open the full color palette with CC_FULLOPEN + CC_RGBINIT and pass to
the function the color that I want to set initially before calling
ChooseColor.

My issue is, I would like to set the color bar that appears beneath
the actual Fill/Back Color and Fill/Fore Color icon on my custom icons
exactly like it does on the standard MS Access icons and be able to
use this last color chosen when you click on it.

Any ideas?
Thanks very much.
KW