Can anybody help me out.

I have a sheet filled with colors. Some of these colors are not preset color
palette colors, but user defined. Now I want to change certain buttons on a
form I have created to have the background color of a cell. I tried the
colorindex and color property, however none of these give the desired result
for the user defined colors.

Therefore I would like to have the RGB code for these colors.
Is this possible or is there any workaround?

Thanks in advance