What is the relationship between DynamicBackColor of a column and SelectedBackColor of a control in a column? Which is the color that actually appears? (I assume it is the column's DynamicBackColor.)

In my grid, there are 5 columns, each of which has a text box that fills the column entirely.

I am using a DynamicBackColor applied to the grid columns.
The grid base class has 3 columns. For this grid, I added two additional columns beyond the 3 that are specified in the base class.

The problem is: for the 3 columns from the base class, the row's color is changing properly according to what I specified in the DynamicBackColor property of the column. For the 4th and 5th columns which I added to the grid, the row's color is changing when the row becomes selected or deselected, but the color is wrong. That is: the unselected back colors are all correct. The selected back colors are correct for the first 3 columns but are a different color for the 4th and 5th columns.

I have checked all the properties of the columns and the textboxes in the columns and can't find any differences. Yet I assume there must be, because the columns are behaving differently.

Any suggestions on where to look?

Thanks!