So I am using the techniques in this thread to use a custom background for my titlebar. Unfortunately the framework places my layout inside a FrameLayout
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There is a lenghty thread over on anddev.org that may be able to help you out
http://www.anddev.org/my_own_titlebar_backbutton_like_on_the_iphone-t4591.html
I have followed it and successfully created my own title bar which allows me to set the padding.
Xml for my title bar:
The above creates a small gray bar with text aligned to the right and left sides