Set background color for Muliple Headers

Is there a way to set the background color for multiple headers withOUT using css?

I am simply using the following code to set the second header bg color to red:

grid.getHeaderTemplate().setStyle("background", "red");


How do I set the bg color for the top most header?

Any help would be greatly appreciated.

If you are using xp theme - the header background is assigned to the inner box, so the code will look like

grid.getHeaderTemplate().getContent("box").setStyle("background", "red");

Thank you Alex! The code is working perfectly!