DataGridView.Rows[i].HeaderCell.Style.ForeColor Not Setting the Color

I have a custom DataGridView in which I set the row header forecolor to different colors in different rows using the code in the title.  It had been working as intended, but when I restructured the form, it stopped working for some reason. 

I've looked through all the properties I can see in VCS2010 Express in all the container controls (UserControl and SplitContainer), but can't find what's causing the problem.  I've also tried to set all the rows to the same (orange) forecolor and backcolor via the RowHeadersDefaultCellStyle, but that didn't work either.  Finally, I set the Dgv's Forecolor and confirmed that the data cell forecolor does change.   Net, I can't seem to change the row header colors.

Any leads on what more I should check?

Thanks.  Steve