GUI2 add in support for Preferences Service

Change-Id: Icdf2165d9f638aeff1b110a64777b93295935ed2
diff --git a/web/gui2/src/main/webapp/app/view/topology/panel/toolbar/toolbar.component.html b/web/gui2/src/main/webapp/app/view/topology/panel/toolbar/toolbar.component.html
index 693e1b5..18f9687 100644
--- a/web/gui2/src/main/webapp/app/view/topology/panel/toolbar/toolbar.component.html
+++ b/web/gui2/src/main/webapp/app/view/topology/panel/toolbar/toolbar.component.html
@@ -63,5 +63,9 @@
                 <onos-icon [iconSize]="25" iconId="m_allTraffic" [toolTip]="lionFn('tr_btn_show_related_traffic')" classes="radioButton selected"></onos-icon>
             </div>
         </div>
+        <div class="separator"></div>
+        <div class="button" id="toolbar-topo2-toolbar-topo2-quickhelp" (click)="buttonClicked('quickhelp-btn')">
+            <onos-icon [iconSize]="25" iconId="query" [toolTip]="lionFn('qh_title')" classes="button"></onos-icon>
+        </div>
     </div>
 </div>
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