Fixes inspector live view functionality.

examples/inspector/js/inspectorDisplayList.js

@@ -1,9 +1,13 @@
 document.getElementById("viewDisplayList").addEventListener("click", function () {
+  if (!gfxWindow) {
+    return;
+  }
+  var currentEasel = gfxWindow.easel;
   var displayList = document.getElementById("displayList");
   if (displayList.children.length === 0) {
-    var displayListTreeView = new Shumway.GFX.TreeRenderer(displayList, currentEasel.stage);
+    var displayListTreeView = new gfxWindow.Shumway.GFX.TreeRenderer(displayList, currentEasel.stage);
     currentEasel.addEventListener("render", function () {
       displayListTreeView.render();
     });
   }
-});
+});