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Not every scenario that makes use of topcomponents has multiple topcomponents. If there is only one topcomponent, the tab isn't necessary and it should be possible to exclude it. Also because it is closeable.
A user comment: "I've been trying to push to use the NB platform, and everytime I show a sample, the first thing that is asked is, do you have to have that tab there, it just takes up space and looks weird." <p>See the comments at the end of this blog entry: <br>http://blogs.sun.com/roller/page/geertjan? entry=netbeans_platform_also_for_small
I posted all the source code for how to do this to dev@openide about 3-4 weeks ago.
I found the source code. I think the most wanted scenario is more like the following: Many people don't just want to have only one TopComponent at all, but they want to have one centered TopComponent (at editor mode) without (the upper part of the) tab and the other TCs (if needed) at other modes with tabs. The source code provided works the other way round that all tabs but the editor mode tabs are gone. So maybe you can attach the code for this scenario?
Use "EditorTabDisplayerUI", instead of "ViewTabDisplayerUI".
This has been discussed, code posted, also in my blog.