go to Window > Customize Perspective > Tool Bar Visibility
You will see : "GDT PulldownToolbar"
- If its unchecked, re-check it. Click on "OK".
- Now you will see the icons on tool bar.
- Again goto same view i.e. "Tool Bar Visibility"
- Un-check the "GDT PulldownToolbar". Click on "OK".
With above steps, I was able to hide the repeating toolbars successfully. (Version: Kepler Service Release 1, Build id: 20130919-0819 : Ubuntu 12.04 LTS 64 bit, GWT plugin 4.3)