Work from Medken branch

Packages/viewerbase/client/components/viewer/hangingProtocolButtons/hangingProtocolButtons.html

@@ -1,6 +1,6 @@
 <template name="hangingProtocolButtons">
     <button id="previousPresentationGroup" type="button"
-            class="imageViewerCommand btn btn-sm btn-default"
+            class="btn btn-sm btn-default"
             data-container="body"
             data-toggle="tooltip"
             data-placement="bottom"
@@ -9,7 +9,7 @@
         <span class="fa fa-step-backward"></span>
     </button>
     <button id="nextPresentationGroup" type="button"
-            class="imageViewerCommand btn btn-sm btn-default"
+            class="btn btn-sm btn-default"
             data-container="body"
             data-toggle="tooltip"
             data-placement="bottom"