Keyboard Accessibility: while tabbing the first element in celltable gets focus

I am working on adding keyboard accessibility to my application. When tabbing from on e widget to another if there is a celltable, it is included in the tabbing sequence. The cell table in not editable, still it gets into tabbing sequence. How do I remove the cell table from tabbing sequence? Is this known issue? Wondering if there are any work arounds? Any help will be appreciated. 

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