iOS Adding custom image to navigation bar

[xmax]

I have made navigation based application with tab bar.
The structure ls like. I have 4 tabs A, B, C, D.
I am switching to view Controller B,C,D from A.
And I can navigate to B,C,D from tab bar as well.
I have set background image for All navigation bar using "insertSubView: atIndex: method".
I am able to set background image to navigation bar.when I switch with tab only.
But navigating through View controller B,C,D, I am not able to see right bar button Item. and It is visible in case of direct switching through tab.
I have set custom view for right bar button item as well.
So, what am I missing?

I am adding custom image to navigation bar in viewDidLoad Method.
All the controllers are TableViewControllers.



Thanks,

xmax.