MINOR,REFA: changed setup of framework control pane

# Conflicts:
#	src/context.js

src/context.js

@@ -172,12 +172,13 @@ class PageBuilder extends ScriptAndStyleContext {
             let pageContextControlPanel = frameworkControlPanel(this._extensions);
             pageContextControlPanel = pageContextControlPanel.generate();
 
-            document.querySelector('body')
+            docBody.insertAdjacentElement(
-                .insertAdjacentElement(
                 "afterbegin",
                 pageContextControlPanel.html
             );
         }
+
+        }
         compelgroups = this._groups;
     }