Using a color-picker App it shows the disabled option button text is RGB(160,160,160). So, you are pretty close with 166.Good Peoples,
I have been unable to find an exact RGB match, but the closest my eyeballs can come is 166, 166, 166.
@Micron ... The purpose is to grey out descriptive text surround the ActiveX option button. If that option button is deselected, the surrounding text--which is a list of chart names--is no longer available.
Lawrence