EPE-36 Allow user to close WU tabs

Fixes EPE-36

Signed-off-by: Gordon Smith <gordon.smith@lexisnexis.com>
Merge pull request #116 from GordonSmith/EPE-36_Close_WU_Tabs

EPE-36 Allow user to close WU tabs

Reviewed-By: Richard Chapman <rchapman@hpccsystems.com>