Buttons lower/higher work.
Buttons lower/higher work.


Former-commit-id: a132328a06fa61a7d83629840e1c07e56f93d8f7
neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox,neuropoly/spinalcordtoolbox