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"

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

@@ -1,7 +1,7 @@
 Template.hangingProtocolButtons.helpers({
     isNextAvailable: function() {
         var presentationGroup = Session.get('WindowManagerPresentationGroup');
-        var numPresentationGroups = WindowManager.getNumPresentationGroups();
+        var numPresentationGroups = Session.get('WindowManagerNumPresentationGroups');
         return presentationGroup < numPresentationGroups;
     },
     isPreviousAvailable: function() {
@@ -9,3 +9,14 @@ Template.hangingProtocolButtons.helpers({
         return presentationGroup > 1;
     }
 });
+
+Template.hangingProtocolButtons.events({
+    'click #previousPresentationGroup': function(e) {
+        $(e.currentTarget).tooltip('hide');
+        WindowManager.previousPresentationGroup();
+    },
+    'click #nextPresentationGroup': function(e) {
+        $(e.currentTarget).tooltip('hide');
+        WindowManager.nextPresentationGroup();
+    }
+});