It seems that it is not possible, but if anyone as a hint on how to create a right-sided sidebar (like a iframe) in google chrome, any hint will help. Thanks.
The experimental sidebar API has, as of this time, disappeared from the chrome documentation, since there is no longer a developer working on it.
Your best bet for something that you can achieve now is a DOM bar, as discussed in Creating a StumbleUpon-like toolbar for Chrome