What you are looking for is impossible. Read the answer from Leonard Rosenthal (Adobe PDF Architect) on the iText mailing list: http://thread.gmane.org/gmane.comp.java.lib.itext.general/55112/focus=55120
Starting with version X of Adobe Reader, there is a new mode called “Reading Mode,” which is the default viewing mode when opening a PDF file in a web browser. In the "reading mode" you can find a translucent floating panel that contains basic reading controls, such as page navigation, printing and scaling.
Canceling "Display in default reading mode" can be done using "Edit"> "Settings"> "Internet" in Adobe Reader X, but there is no way to programmatically disable the "reading mode".
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