How to add background in the 2-pane preference screen?

in my app, i made a 2 pane preference screen following the API Demos examples. but i am not getting 开发者_如何学编程any background for the header pane. it is totally transparent. do i need to add imagebuttons for the headers?

I am not familiar with Honeycomb but I assume View subclasses will have the XML attribute background, or setBackgroundResource(int). Check to see if you can get the view/layout of the header pane to add a background to it.