Code cleanup. Replaced mock of TreeViewControl with actual TreeViewControl instance where possible. Dispose SurfaceLine selection view and DikeProfile selection views (for when generating calculations) Related to Issue [WTI-634] git-svn-id: https://repos.deltares.nl/repos/WettelijkToetsInstrumentarium/trunk@3788 5a3db67b-de53-47b5-99c8-a1c30a6650e2